TS ICET 23 May 2019 Shift 2 Paper

Question : 141 of 200

Marks: +1, -0

The arithmetic mean of 10 observations is 48. If two more observations 65 and 75 are added to the data, then the arithmetic mean of the entire data of 12 observations is:

$51 2/3$
$52 2/3$
$52 1/5$
$53 3/5$

Validate

Solution:

The sum of 10 observations

= 10 × 48 = 480

.
The sum of 2 observations

= 65 + 75 = 140

.
The sum of 12 observations

= 620.

Arithmetic mean of 12 observations

=620/12=51{2/3}

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