Answers

2016-03-30T12:03:57+05:30
Frequency = 20

mean = 25

∑x/20 =25

x= 20×25 = 500

each observation is decreased by 2

so the sum of new observation will be

500 - 20×2
500-100 = 400 
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2016-03-30T12:22:40+05:30
23 in my opinion it is the answer
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