Suppose you see a pie graph showing the results of a survey. The purpose of the survey is to determine the number and proportion of families in a certain city earning incomes in various ranges. Actual...

Suppose you see a pie graph showing the results of a survey. The purpose of the survey is to determine the number and proportion of families in a certain city earning incomes in various ranges. Actual numbers are, for some reason, not indicated on this pie graph. But you see that one of the ranges has a ‘‘slice’’ with an apex (central) angle of 908. From this, you can assume that the slice corresponds to

(a) the families whose earnings fall into the middle 25% of the income range

(b) 25% of the families surveyed

(c) 1/π of the families surveyed (π is the ratio of a circle’s circumference to its diameter)

(d) the families whose earnings fall within the interquartile range