The time required to finish a test in normally distributed with a mean of 40 minutes and a standard deviation of 8 minutes. what is the probability that a student chosen at random will finish the test in less than 48 minutes? 84% 2% 34% 16%

84%.

Step-by-step explanation:

Let X be the time in minutes for a student chosen at random to finish the test.  .

The probability that a student chosen at random finishes the test in less than 48 minutes will represented as

.

Evaluate the cumulative normal probability on a calculator, where

.

.

.

Look up the entry that corresponds to on a z-score table: 0.8413.

In other words,

.