Answer: -0.36
Step-by-step explanation:
Given: Mean : 
Standard deviation : 
We know that the formula to calculate the z-score is given by :-

For x=8.2 minutes, we have

Hence, the z-score for this amount of advertising time = -0.36
Answer:

Step-by-step explanation:
Decimal Fraction Percentage
0.16
16%
Think of it like this, by definition, decimals are already fractions, with their denominators being powers of 10.
0.16 =
← there are 2 decimal places → 2 zeros
In simplest form,
= 
So, we get our answer to be;
.
Answer:
Smaller number is 18 and larger number is 29
Step-by-step explanation:
let x be the larger number and y be the smaller number
x=2y-7
2y-7+y=47
3y=54
y=18
x=36-7=29
Answer:
b
Step-by-step explanation:
we have

Rewrite the expression

we know that
When multiplying two powers that have the same base, you can add the exponents
so
