Question

a test was given to 400students of whom 150 boys and rest were girls. the boys had an average score 72 with S. D. 7,while the girls had an average score of 73 with S. D. 6.4.find the mean and S. D. of the class as a whole​

Answer 1

Answer:

hey here is your answer in above pics

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being a science student I could also help you in commerce as I have a keen interest in maths especially in geometry and statistics