suppose the mean of 30 numbers is 520 if 20 of these numbers are each increased by 12 and remaining are decreased by 6 the. then the mean of the new set of numbers is
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Step-by-step explanation:
mean0f 30 =520
increased in mean=520+(12×20)/30+
=520+8+=528
decreased mean =(6×10)/30=2
new mean =528-2=526
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