Question

ASAP please

The weights of the watermelons in a local grocery store is normally distributed. The mean weight is 18 pounds with a standard deviation of 1.5 pounds. How much do the middle 95% of the watermelons weigh?
Between 15 and 21 pounds
Between 16.5 and 19.5 pounds
Between 13.5 and 22.5 pounds
Between 17.1 and 18.9 pounds

Answer 1

Since it's normally distributed, we can apply the emperical rule. The middle 95% will be within two standard deviations of the mean, so that means:

18-2(1.5), 18+2(1.5)=15,21

So we want the first option.