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#12992

statistics

data analysis

average

hard

90 sec

Data set X consists of the scores of 30 students and has a mean score of 80. Data set Y consists of the scores of 20 students and has a mean score of 30. Data set Z consists of the scores of the 50 students from data sets X and Y. What is the mean score 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.