The average age of a group of 7 athletes is 22 years. An athlete whose age is 36 years joins the group. Will the average age increase or decrease? Find out by how much?
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Answer:
mean = sum of observation / no of observation
22= sum of observation / 7
sum of observation = 154
now one athlete is replaced by another athlete whose age is 36
therefore now mean will become 168
( mean = 22+22+22+22+22+22+36/7)
difference in mean is =168-154
= 14
now find average age = 168/7 = 24
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