Q6 of 37 Page 14

A data has 25 observations arranged in a descending order. Which observation represents the median?[CBSE 2014]

Since we have 25 observations, that is odd number of observations, median is found at position.

So since, n = 25

⇒ Median will be found at position. ⇒ Median = 13^th observation

If the mean of 5 observations x, x + 2, x + 4, x + 6 and x + 8 is 11, find the value of x.[CBSE 2014]

If the mean of 25 observations is 27 and each observation is decreased by 7, what will be the new mean?[CBSE 2014]

The following are the ages of 300 patients getting medical treatment in a hospital on a particular day:

Age (in years)	10 - 20	20 - 30	30 - 40	40 - 50	50 - 60	60 - 70
Number of patients	60	42	55	70	53	20

Form a 'less than type' cumulative frequency distribution. [CBSE 2013]

In the following data, find the values of p and q. Also, find the median class and modal class. [CBSE 2013]