A particular fruit's weights are normally distributed, with a mean of 317 grams

Question

A particular fruit's weights are normally distributed, with a mean of 317 grams and a standard deviation of 21 grams.

The heaviest 12% of fruits weigh more than how many grams?

Give your answer to the nearest gram.

Answer 1

z score for top 12% = z score for 88th %. Look up the table. It is 1.17

score = 317+1.17* 21 = 341.57