The mean of marks of 40 students is 56.5. Later it was found that one student was given 85 marks instead of 58. Find the correct mean.
Answers
Answered by
16
Mean score = 40
mean=sum of observation /no of observations
sum of observations = mean * no of observations
that is 40 x 100
= 4000
after replacement, sum of new observation=4000-83+53
=3970
mean of new observation = 3970/100
=39.7
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Answered by
10
Answer:
39.52
Step-by-step explanation:
Mean ( x ) = 40
Mean= sum of observation / No. of observations
Sum of observations = Mean * No of observations
= 40 x 56.5
= 2260
after replacement, sum of new observation= 2260-85+58
=2233
Mean of new observation = 2233 / 56.5
= 39.52
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