Answer:
The standard deviation is 6
Step-by-step explanation:
The scores of a given test were normally distributed with a mean of 82.

James received a 67 with a z-score of -2.5
Z score = -2.5

Formula :



Hence The standard deviation is 6
I hope this helps ( there is no negatives )
Answer:
The result is 7.8 * 10^3
Step-by-step explanation:
When we are dividing in scientific notation, divide the numbers in front
7.8/1 = 7.8
Subtract the exponents on the powers of 10
10^(7-4) = 10 ^3
The result is 7.8 * 10^3
Answer:
Step-by-step explanation:
Step one: 9÷1.5= 6
Step two: 3·6=18
The actual book is 18 inches tall and 9 inches wide