1.The data below is obtained from 28 fish that were caught in Lake Chad in Nigeria.

14.7

15.3

15

15.1

14.8

15

14.9

15

14.7

15

14.7

14.9

15.1

15

14.6

15.2

14.7

15

15.2

15.2

15.1

14.7

15.3

14.6

14.9

15.2

14.8

15.3

The variance of the population of fish in this lake is 6.25.

Find a 90% confidence interval for the population mean length of the fish.