Author Question: When finding percentiles, if the locator L is not a whole number, one procedure is to interpolate so ... (Read 40 times)

sarasara · **on:** Jul 25, 2018

When finding percentiles, if the locator L is not a whole number, one procedure is to interpolate so
that a locator of 23.75, for example, leads to a value that is 3/4 of the way between the 23rd and
24th scores.

Use this method of interpolation to find P75 for the set of test scores below.
51 54 64 68 72 74
76 83 94 94 99
A) 83 B) 88.5 C) 85.75 D) 94

Question 2

A department store, on average, has daily sales of 28,372.72. The standard deviation of sales is
2000. On Tuesday, the store sold 34,885.21 worth of goods. Find Tuesday's z score. Was Tuesday
an unusually good day?

A) 3.26, yes B) 3.42, no C) 2.61, no D) 3.57, yes