Answer: 0.0775
Step-by-step explanation:
Given : Mean : 
Standard deviation : 
Sample size : 
Since its normal distribution , then the formula to calculate the z-score is given by :-

For x= 28.2 hours

For x= 30 hours

The P- value = 

Hence, the probabiliy that the average time spent stydying for the sampe was between 28.2 and 30 hours = 0.0775
Answer:
D. 5/4
Step-by-step explanation:
A. 5.4 can't be 'cause the shade did not reach 5 on number line.
B. 5 - 4 = 1 can'e be 'cause it pass 1.
C. 4 / 5 = 0.8 can't be 'cause its less than the shade.
D. 5 / 4 = 1.25 correct
Answer:
-19
Step-by-step explanation:
you first substract 7 from 83 since its the inverse operation
then you divide it by -4 which give you -19
Answer: 24%
Step-by-step explanation:
Answer:The first one 18in.2
Step-by-step explanation: