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Question

The mean of 6 observation is 60. If one of the number is excluded , then the mean becomes 45, find the excluded number


A

135

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B

125

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C

95

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D

15

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Solution

The correct option is A

135


The mean of 6 observation is 60

Hence the total sum of 6 observation = 60 × 6 = 360

The mean of the 5 observation is 45

Hence the total sum of 5 obsevation = 45 × 5 = 225

The excluded number = Total sum of 6 observation - Total sum of 5 observation

= 360 - 225

=135


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