Question

For a group of 50 boys, the mean score and standard deviation of scores on
a test are 59.5 and 8.38. for a group of 40 girls, the mean and standard deviation
are 54.0 and 8.23 on the same test. Find the mean and standard deviation for
the combined group of 90 children’s.

Answer 1

Step-by-step explanation:

8.3856

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