Created by StemPy LabA swimming club has boys with a mean height of and girls with a mean height of . What is the mean height of all swimmers?
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← The monthly pocket money of a group of students has a mean of 20 coins and a standard deviation of 4 coins. A grandparent gives every student 7 more coins. What are the new mean and the new standard deviation?Two brands of light bulbs are tested. Brand X has a mean life of 800 hours and a standard deviation of 56 hours. Brand Y has a mean life of 1200 hours and a standard deviation of 72 hours. Which brand has the more consistent life, and what is its coefficient of variation? →
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