Question

The mean of marks obtained by 15 students is 63 . If marks of two students were read wrongly 73 instead of 78 and 59 instead of 56, find the correct mean.​

Answer 1

Answer:

The mean of marks obtained 15 students =63

2Students were read - 73 instead of 78 and 59 instead 69.

Marks obtained by 15 students=63*15

=945

=945+15

=960

The correct mean marks of 15 students =960/15

=64

hope it helps

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Answer 2

Answer:

64

Step-by-step explanation:

Mean of the marks of 15 students= 63

By mistake marks of 2 students were readed as= 73 instead of 78, 59 instead of 69

Marks obtained by 15 students= 63*15

=945+15

=960

the correct mean marks of 15 students =960/15=64