Mathematics, 04.08.2021 17:50 Chartwig1908

water bill in X secondary school average is 120 with standard deviation of 85, what percent have a water bill between 65 and 504. all expenses being in kwacha. ( hint: use k = 2, 3 & 4)

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water bill in X secondary school average is 120 with standard deviation of 85, what percent have a w...