The length of time a person can stay under water is normally

The length of time a person can stay under water is normally distributed with a mean of 3 minutes and a standard deviation of 1.5 minutes? If a person has a z-score of 0.7, how long can they stay under water?

3.25 minutes

1.95 minutes

3.70 minutes

.7580

95%

4.05 minutes

Solution

X -- Length of time a person can stay under water

X is N(3, 1.5)

Z score =0.7 means

Corresponding z score = 3+1.5(7) = 4.05 minutes

Hence right answer is F. 4.05 minutes