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Given below is the stem-and-leaf display representing the amount of detergent used in gallons (with leaves in 10ths of gallons) in a month by 25 drive-through car wash operations in Phoenix.
9 | 147
10 | 02238
11 | 135566777
12 | 223489
13 02
A. If a frequency distribution for the amount of detergent used is constructed, using "9.0 but less than 10.0 gallons" as the first class, what would the frequency of the “11.0 but less than 12.0 gallons” class be?
B. If a percentage histogram for the detergent data is constructed, using "9.0 but less than 10.0 gallons" as the first class, what would the percentage of drive-through car wash operations that use “12.0 but less than 13.0 gallons” of detergent be?
1 answer
A multiple regression equation is y = -8.5 + 0.964a + 8.104b, where ‘a’ is a person’s age, ‘b’ is the person’s body fat percentage, and ‘y’ is the person’s lean mass percentage. Predict the lean mass for a person who is 27 years old and has a body fat of 0.045.
2 answers