The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 1-46414-253-X
ISBN 13: 978-1-46414-253-6

Chapter 6 - Two-Way Tables - Apply Your Knowledge: 6.1b

Answer

Marginal distribution is the sum of counts of each column divided by sample size of 1808 As & Bs = $\frac{736+205}{1808} = 0.5205 = 52.05%$ Cs = $\frac{450+144}{1808} = 0.3285 = 32.85%$ Ds & Fs = $\frac{193 + 80}{1808} = 0.1510 = 15.10%$ From this we can deduce that 32.85% + 15.10% = 47.95% of students received a Grade C or lower

Work Step by Step

As given above
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