The mean of the following distribution is 24. find the value of p Marks 0-10 10-20 20-30 30-40 40-50 50-60
no. of
students. 15. 20. 35. p. 10. 42

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I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )