8.91 $
Step-by-step explanation:
First you need to get rid of the 50 cents for each book and there's 5 books so it's 2.50 for all of them
95.19-2.50= 92.65
Next get rid of the tax
92.65 x 0.038 (decimal version of 3.8%)= 3.52 (the amount of tax April paid)
92.65-3.52= 89.13
Now get rid of the 10% for each book or 50%
89.13 x 0.5 = 44.565
Divide by 5 for each book and you have the prices of the book after the sale which is 8.913 or 8.91 $
The prices of each book before the sale were 17.83 if you needed to know
Answer:
The mean will stay the same.
The standard deviation will decrease.
Step-by-step explanation:
For the 5 cards, she has received, the mean will be:
μ=(∑x)/n
=125/5
=25
The mean is 25 and the standard deviation is 10.
σ=10
If a new card is received with $25, then the sum will be $150
So the new mean will be:
μ'=(∑x)/n
=150/6
=25
And the new standard deviation will be:
σ'= 9.12
We can clearly see that
μ= μ'
and
σ> σ'
So the mean will remain the same and standard deviation will decrease.
.
Answer:
Right
Step-by-step explanation:
Answer: 0.64
Step-by-step explanation:
Given : The heights of women aged 20 – 29 in the United States are approximately Normal with 
inches and 
inches.
Let x denotes the height of women.
Since 1 feet = 12 inches
5.5 feet = 
inches
Then, the z-score corresponds to x=66 inches will be :-
Hence, the z ‑score for a woman 5.5 feet tall = 0.64
We have the next formula to calculate the volume
where a is the length of the side in the base and h is the height
a=11cm
h=15cm
we substitue the values in the formula
