10 is the mean of a set of 7 observation...

10 is the mean of a set of 7 observations and 5 is the mean of a set of 3 observations. The mean of a combined set is given by

A

15

B

10

C

8.5

D

7.5

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Model Test Set - 10
UNITED BOOK HOUSE|Exercise Exercise |41 Videos
Model Test Set - 5
UNITED BOOK HOUSE|Exercise Exercise|43 Videos

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Knowledge Check

The mean for the observation 1, 2, 3,4 is

A

4

B

2.5

C

3.6

D

none of these

The median of a set of 9 distinct observations 20.5. If each of the largest 4 observation of the set is increased by 2, then the median of the new set

A

a) is increased by 2

B

b) is decreased by 2

C

c) is two times the original median

D

d) remains the same as that of the original set

The mean of a set of observations is overlinex If observations is divided by alpha, alpha ne 0 , and then is increased by 10 then the mean of the new set is

A

`overlinex/alpha`

B

`(overlinex+10)/alpha`

C

`(overlinex+10alpha)/alpha`

D

`aoverlinex+10`

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