Answer:
The expected number of keys she will try before she opens the door is 4.5.
Step-by-step explanation:
Probability of opening with the first key:
One key out of 8 working, so: 1/8 probability of opening with the first key, that is:
[tex]P(X = 1) = \frac{1}{8}[/tex]
Probability of opening with the second key:
Doesn't work on the first(7/8 probability), works on the second(1/7 probability). So
[tex]P(X = 2) = \frac{7}{8}*\frac{1}{7} = \frac{1}{8}[/tex]
Following the logic:
For each value of x from 1 to 8, we have that [tex]P(X = x) = \frac{1}{8}[/tex]
Find the expected number of keys she will try before she opens the door.
Each outcome multiplied by its probability. So
[tex]E(X) = 1\frac{1}{8} + 2\frac{1}{8} + 3\frac{1}{8} + 4\frac{1}{8} + 5\frac{1}{8} + 6\frac{1}{8} + 7\frac{1}{8} + 8\frac{1}{8} = \frac{1+2+3+4+5+6+7+8}{8} = 4.5[/tex]
The expected number of keys she will try before she opens the door is 4.5.
Find the scale factor of ΔABC to ΔFGH.
Answer:
4:3
Step-by-step explanation:
AC=8
FH=6
8/6=4/3=4:3
Help pls I’ll give extra poinys
Answer:
Step-by-step explanation:
Anybody good at math 8th grade homework
Answer:
Step-by-step explanation:
I could help you
but I need you help two just in two questions just post them pls answer them and i will help u
Will mark brainiest if u give a real answer not a link
create an exponential function given 2 point
1. (-1,2) and (1,8)
2. (1,1) and (-1,4)
1. y = 4 * 2^x
2. y = 2(1/2)^x
I hope this helps you, have a good day!
3 What is the median of the data shown?
38, 50, 43, 33, 35, 30, 64, 43, 41
А 34
B 35
С 41
D 43
(10000*C)/1.05+(10000*C)/1.05^2…..(10000*C)/1.05^13=100
Find C?
9514 1404 393
Answer:
C ≈ 0.00106455765168
Step-by-step explanation:
This is the sum of 13 terms of the geometric series that has 10000C/1.05 as the first term and a common ratio of 1/1.05. The sum S is given by ...
S = a1(1 -r^n)/(1 -r) . . . . a1 is the first term, r is the common ratio
Using the known values, we have ...
100 = (10000C/1.05)(1 -1.05^-13)/(1 -1/1.05))
0.01 = C(1 -1.05^-13)/0.05
C = 0.0005/(1 -1.05^-13) ≈ 0.0005/0.469679
C ≈ 0.00106455765168
Answer:
C ≈ 0.00106455765168
Step-by-step explanation:
100 = (10000C/1.05)(1 -1.05^-13)/(1 -1/1.05))
0.01 = C(1 -1.05^-13)/0.05
C = 0.0005/(1 -1.05^-13) ≈ 0.0005/0.469679
C ≈ 0.00106455765168
7,8,10,10,12,15 what is the mean of these numbers?
Marking brainliest
Answer:
10.3
Step-by-step explanation:
(7 + 8 + 10 + 10 + 12 + 15) / 6 = 10.333
pls help
no links
10 pts
Answer:
98 cm^2
Step-by-step explanation:
7 x 14 =98
what is 78.57 rounded to the nearest hundredth?
Answer:
79 would be rounded to the nearest hundredth
Answer:
78.57
Step-by-step explanation:
The number in the hundredths place is 7. 78.570
So then you look to the number to the right which is zero so you round down to 78.57
So, the answer is the same.
78.57
Hope this helps!
What does the series represent to the bike owner answer all plz :)
Answer:
lol or i could just answer it on here
Step-by-step explanation:
8x – 9y = –61
x +9y = 43
what is the y coordinate?
Answer:
The answer is y=5
Step-by-step explanation:
9x=-18
x=-2
-2+9y=43
9y=45
y=5
HELPPOOOOOOOOOO!!!!!!!!!!!!!!!!!!!
Answer:
the correct answer is3 1/2
Select whether the triangle
is inscribed in the circle, circumscribed about the
circle, or neither.
B
• inscribed in the circle
© circumscribed about the circle
• neither
Answer:
it is inscribed in the circle.
Step-by-step explanation:
help me ASAP
Helppppppppppppppppp
Answer:
(2,4)
Step-by-step explanation:
I painfully counted every square to find that a 1 by 1 square is divided into an 8 by 8 square.
K is one square above 1/2, for the second coordinate is 4.
K is also 2 to the left of 0, so the first coordinate is 2.
Therefore, the coordinates of K are (2,4).
What is the probability that a customer ordered a hot drink given that he or she ordered a large?
Plz help me well mark brainliest if you are correct!
Answer:
Hello! answer: B
Step-by-step explanation:
B marks -1.5 on the number line. HOPE THAT HELPS!
an ___ is a statement of equality of two algebraic expressions involving one or more unknown quantities
Answer:
Equation
Step-by-step explanation:
an equation is a statement of equality of two algebraic expressions involving one or more unknown quantities.
find the midpoint segment with the following endpoints. (2,-9) and (-4,-4)
Answer:(4, 5) .
dkfjsdlkfjsdlkfjsdklfjsdlkfj
What is the point-slope form of a line with slope-5 that contains the point
(2, -1)?
Answer:
point slope form
y-y1=m(x-x1) where
m=slope and you are given a point (x1,y1)
slope=-5
point is (2,-1)
x1=2
y1=-1
m=-5
so
y-(-1)=-5(x-2)
y+1=-5(x-2) is answer
Write the slope-intercept form of the equation of the line.
Help Help Help Help Help FAST GO ZOOOOOOOOOOOOM WITH THIS QUESTION PLEASE
Answer:
A. 60+x=90
Step-by-step explanation:
Complimentary angles are angles that add to 90.
The radius of a circle is 7.9 ft. Find the circumference to the nearest tenth.
Answer:
7.9
2 x 3.14 x 7.9 = 49.612 rounded up will be: 49.6 ft
A puppy’s weight increased from 12 pounds to 15 pounds. By what percentage did the puppy’s weight increase?
=======================================================
Work Shown:
A = old value = 12 pounds
B = new value = 15 pounds
C = percent change
C = [ (B-A)/A ] * 100%
C = [ (15-12)/12 ] * 100%
C = (3/12)*100%
C = 0.25*100%
C = 25%
The positive C value indicates a percent increase
So effectively, we find the difference or change in weight (B-A) and divide it over the original weight (A). That leads to 0.25 which converts to 25%
Note that,
25% of 12 = 0.25*12 = 3
This says that the puppy gained 3 pounds, which is the value of B-A
Since the puppy gained 3 pounds, the new weight is 12+3 = 15 pounds
-----------
As an alternative, we could divide the two values B over A to find that
B/A = 15/12 = 1.25
Then subtract 1 from this result: 1.25 - 1 = 0.25 = 25%
Megan earned the following test grades for the third nine weeks: 95, 84, 90, 78, 83. Find the mean absolute deviation of the data. Do not round, enter any decimal.
Answer:the answer is FREE COINS!
Step-by-step explanation:
A box is to be wrapped in a shiny red decorative paper.The box is 9 inches long,5 inches wide,and 4 inches high.How much wrapping paper would be needed to completely wrap this box?
Answer:
Draw a figure!
There are 6 surfaces to add.
4 of them have area 9*5 and 2 have area 5*4.
You should be able now to compute the surface areas.
Step-by-step explanation:
plz help me with thiss
Answer:
subject?
Step-by-step explanation:
Answer:
See belowStep-by-step explanation:
Refer to attached
When plotted the points and connected, it is clear that from the shape of the lines that f(x) is exponential and g(x) is linear function.
Small correction, f(1) should be 1/2, otherwise with repeat values it is not a function.The intersection of the graphs is also given, with added section of function f(x), it is clear the added point is (-3, 8) and connected with red line segment. Approximate coordinates are indicated (-2.54, 6.15)
Which is the rate of change for the interval between 2 and 6 on the x-axis?
Help anyone and can anyone explain this too!
Answer:
X = 9
Step-by-step explanation:
Vertical angles equal to each other, the example shows vertical angles.
6x + 2 = 54
-2 -2
6x/6 = 54/6
X = 9
Hope this helps you have a nice day!
I need help answering this
Gabe walks from his house to the library then to the gymnasium what is the total distance he walked
Answer:
4.6 and 10.3
Step-by-step explanation: