The total numbers of eggs laid in the nests of two species of bird were recorded over several breeding seasons.

The numbers of eggs laid in the nests of 10 wrens and 10 dunnocks are:

Wrens: 22, 18, 21, 23, 17, 23, 20, 19, 24, 13.

Dunnocks: 28, 24, 23, 19, 30, 27, 22, 25, 22, 17.

a. Represent the data in a back-to-back stem-and-leaf diagram with rows of width 5.

b. Given that all of these eggs hatched and that the survival rate for dunnock chicks is 92%, estimate the number of dunnock chicks that survived.

c. Find the survival rate for the wren chicks, given that 14 did not survive.