elias bought five books.their mean price was $3.25.the total cost for four of the books was $11.75.what was the cost of fifth book?
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Answer:
let the price of fifth book be x
mean = sum of observation/ number of observation
3.25 = 11.75+ x /5
5×3.25 = 11.75+x
x = 16.25 - 11.75
x = 4.50
the cost of fifth book is ₹ 4.50
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