Jiffy Lube has franchises in two different parts of a city. The number of oil changes made daily, for 25 days, is given below.

(a) Construct a frequency distribution for each store with a first class of 15–20. 

(b) Draw a histogram indicating the number of oil changes at each store. 

(c) Using the histogram, determine which store appears to have a greater mean, or do the means appear about the same? Explain. 

(d) Using the histogram, determine which store appears to have the greater standard deviation. Explain. 

(e) Calculate the mean for each store and determine whether your answer in part (c) was correct.

(f)  Calculate the standard deviation for each store and determine whether your answer in part (d) was correct.

Transcribed Image Text:

East Store 33 59 27 30 42 19 42 25 22 32 27 57 37 52 67 38 44 43 15 31 49 41 35 West Store 38 46 38 38 30 38 38 37 39 31 39 36 40 37 47 30 34 42 45 29 31 46 28 45 48 43 40