Question

The mean of 20 observations is 12. If each observation is increased by 5, then find the new mean
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Answer 1

Answer:

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Answer 2

Step-by-step explanation:

#mean of 20 observation is 12

#mean= sum of observations÷no.of observation

#let sum of observations be x

#x/20 =12

#x=240 (multiply 20 ✖ 12)

# therefore sum of ob. = 240

#when each number is increased by 5;

#sum of observations increases by ;= 20*5=100

#sum of new observation= 340(240+100)

#new mean = 340/20

#new mean = 17