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#7670

statistics

data analysis

arithmetic mean

average

word problem

medium

75 sec

Calculator OK

Data set X consists of the heights of 80 trees and has a mean of 25 feet. Data set Y consists of the heights of 40 trees and has a mean of 55 feet. Data set Z consists of the heights of the 120 trees from data sets X and Y. What is the mean, in feet, of data set Z?

• Up to 5 characters (6 if negative). Only numbers, decimal (.), fraction (/), negative (-).
• Fractions must be in lowest terms.
• Mixed numbers must be converted to improper fractions.