Question
Mathematics Question on Variance and Standard Deviation
The arithmetic mean and standard deviation of a series of 20 items were calculated by a student as 20 cm and 5 cm, respectively. But while calculating them an item 13 was misread as 30. The correct standard deviation is
A
4.53
B
4.66
C
4.95
D
4.88
Answer
4.66
Explanation
Solution
The correct option is(B): 4.66