The average marks obtained by S class of 70 students was found to be 65. Letter on it was detected that the marks of 1 student was wrongly recorded as 85 instead of 58. Find the correct mean
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n=70
x bar = 65
here,
bar X = summation xi ÷x
therefore summation xi = bar x *n
= 65*70
=4550
correct summation xi =4550-85+58
=4523
correct mean= correct summation xi ÷n
= 4523÷70
= 64.6142857...
x bar = 65
here,
bar X = summation xi ÷x
therefore summation xi = bar x *n
= 65*70
=4550
correct summation xi =4550-85+58
=4523
correct mean= correct summation xi ÷n
= 4523÷70
= 64.6142857...
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