Answer:
14
Step-by-step explanation:
If 12 is 20%, then 24 is 40%, then 36 is 60%, then 48 is 80%, then 60 is 100%
So there are 60 questions on the test.
Answer:
D. 14.32
Step-by-step explanation:
The formula for standard deviation is:

The mean μ is 33.
The (x minus μ) squared are 361, 49, 49, 361 respectively.
So that the SD = 
X= 14 + 9y over 2
y= -x - 7 over 6
Answer:
769769769/1000000000
Step-by-step explanation: