In melanie's styling salon, the time to complete a simple haircut is normally distributed with a mean of 25 minutes and a standard deviation of 4 minutes. the slowest quartile of customers will require longer than how many minutes for a simple haircut?

(a) 3(n+1)/4 minutes
(b) 26 minutes
(c) 25.7 minutes
(d) 27.7 minutes

(D) 27.7 minutes

Step-by-step explanation:

The slowest quartile starts at the 75th percentile:

The z-score for the 75th percentile is approximately 0.675. Z-score is given by:

Where 'μ' is the population mean and 'σ' is the standard deviation

At the 75th percentile, the time for a haircut is:

Therefore, the slowest quartile will require at least 27.7 minutes for a haircut.

the answer is c.

step-by-step explanation: