The mean of 20 items is 55. If two items 45 and 30 are removed, the new mean of the remaining items is :
A. 65.1 B. 65.3 C. 56.9 D. 56 Answer: Option CShow Answer
Solution(By Apex Team)
According to the question,
Mean of 20 items is = 55
Sum of 20 items is
= 55 × 20 = 1100
Two items removed
= 45 + 30 = 75
Now, sum of 18 items
= 1100 – 75
= 1025
∴ Average
$\large=\frac{1025}{18}$
= 56.9
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