=+7.6 A pizza shop sells pizzas in four different sizes. The 1000 most recent orders for a single pizza gave the following proportions for the various sizes:

Size 12 in. 14 in. 16 in. 18 in.

Proportion .20 .25 .50 .05 With x denoting the size of a pizza in a single-pizza order, the given table is an approximation to the population distribution of x.