When finding percentiles, if the locator L is not a whole number, ...

[sarasara]

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

[mohan]

Answer to Question 1

C

Answer to Question 2

A

[sarasara]

Thanks for the timely response, appreciate it

[sultansheikh]

Wow, this really help