Hens usually begin laying eggs when they are about 6 months old. Young hens tend to lay smallereggs, often weighing less than the desired minimum weight of 50 grams. Complete parts(a) through(c) below.

b) By the time these hens have reached the age of oneyear, the eggs they produce average 66.9 grams, and 98% of them are above the minimum weight. What is the standard deviation for these olderhens?