A school has 5 divisions in class IX having 60, 50, 55, 62 and 58 students. Mean marks obtained in a History test were 56, 64, 72, 63 and 50 by each division respectively. What is the overall average of the marks per student?
A56.8
B58.2
C62.4
D60.8
Mathematics · Question Bank
Statistics
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The probability that a randomly chosen sales prospect will make a purchase is 0.18. If a salesman calls on 5 prospects, what is the probability that the salesman will make exactly 3 sales?
A0.0392
B0.0239
C0.0329
D0.0293