Question

mean of 20 observations is 17. if 20 is replaced by 40 in observation. find the new mean​

Answer 1

Answer:

18

Step-by-step explanation:

mean = sum of observations/ total no. of observations

17 = x / 20

x = 17 × 20

x = 340

Thus, sum of observations = 340

when 20 is replaced by 40

the sum of observations= 340-20+40=360

new mean = 360/20

= 18

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