Question

mean of 15 observations was found to be 80.4 later on it was discovered that 96 was misread as 69 find the correct mean

Answer 1

Answer:

82.2

Step-by-step explanation:

80.4 = (x1+x2+......+x15)/15

80.4X15 = (x1+x2+......+x15)

1206 =  (x1+x2+......+x15)

now, adding right number and subtracting wrong number

1206 + 96 - 69

new sum = 1233

new mean,   1233/15

new mean = 82.2 (Answer)

Answer 2

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