The heights, x cm, of 200 boys and the heights, y cm, of 300 girls are summarized
Question:
The heights, x cm, of 200 boys and the heights, y cm, of 300 girls are summarized by the following totals:
Σ(x −160)2 = 18 240, Σ(x −160) = 1820, Σ(y −150)2 = 20 100, Σ(y −150) = 2250.
a. Find the mean height of these 500 children.
b. By first evaluating x2 and y2, find the variance of the heights of the 500 children, including appropriate units with your answer.
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a To find the mean height of the 500 children we can use the formula mean x y nx ny where x is the s...View the full answer
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Related Book For 
Cambridge International AS & A Level Mathematics Probability & Statistics 1 Coursebook
ISBN: 9781108407304
1st Edition
Authors: Dean Chalmers, Julian Gilbey
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