Question

Q.

Summary information is given for the weights (in pounds) of 1000 randomly sampled tractor-trailers that were traveling on Federal highways in 1995.

MIN: 4,000 MAX: 10,600

AVE: 7,000 25%: 5,600

75%: 8,600 Std.Dev : 1,400

Find the percentage of tractor trailers with weights between 5,600 and 8,600 pounds.

Answer 1

Solution:

From given numerical summary of the data, we have

Percentage of tractor trailers with weight less than 5600 pounds = 25%

Percentage of tractor trailer with weight less than 8600 pounds = 75%

Percentage of tractor trailer with weights between 5600 pounds and 8600 pounds =

Percentage of tractor trailer with weight less than 8600 pounds - Percentage of tractor trailers with weight less than 5600 pounds

Percentage of tractor trailer with weights between 5600 pounds and 8600 pounds = 75% - 25% = 50%

Required percentage = 50%