Statistics Quiz 9

The mean of 10 numbers is 7. The mean of 15 numbers is 12 then the mean of all observations is …………

Mode of 2004, 2005, 2006, ………………… 2015 is …………

The sum of the lower limit and upper limit of the modal class from the given distribution table.

Class	10-20	20-30	30-40	40-50	50-60	60-70
Frequency	2	8	17	11	9	8

Mean of first ‘n’ natural numbers is ……………

The mean of a data is 9. If each observation is multiplied by 3 and then 1 is added to each result, then the mean of new observation is…………

Average of 11 scores is 10.5. If one score 9 is deleted, then the average of the remaining scores is …………

……… is effected by extreme values.

If each observation of data is increased by ‘a’ then mean is increases by…………

To find median, classes should be ………

For a distribution with odd number (n) of observations, the median is ……………… observation

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