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#12991

statistics

data analysis

average

hard

90 sec

Data set P consists of the weights of 40 items and has a mean of 50 kilograms. Data set Q consists of the weights of 60 items and has a mean of 70 kilograms. Data set R consists of the weights of the 100 items from data sets P and Q. What is the mean, in kilograms, of data set R?

• 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.