Mean of 100 items is 49. It was discovered that three items which should have been `60, 70,80` were wrongly read as `40, 20, 50` respectively. The cor

Question

Mean of 100 items is 49. It was discovered that three items which should have been `60, 70,80` were wrongly read as `40, 20, 50` respectively. The cor

Mean of 100 items is 49. It was discovered that three items which should have been `60, 70,80` were wrongly read as `40, 20, 50` respectively. The correct mean is. (a) `48` (b) `82 1/2` (c) `50` (d) `80`
A. 48
B. 82.5
C. 50
D. 80

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - C
Sum of 100 items `=49xx100=4900`
Sum of items added=60+70+80=210
New sum =4900+210-110=5000
`therefore " Correct mean" =(5000)/(100)=50`

5 views Answered 2023-02-05 15:29