Question

A survey was carried out to find the approximate number of hours that 20 people spent watching tv. Calculate the following in respect of the number of hours

Answer 1

Given : A survey was carried out to find the approximate number of hours that 20 people spent watching tv.

7  , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 15 , 17 , 19 , 21 , 22 , 23 , 25 , 28 , 29 , 29 , 29

To Find :  Upper Quartile

a) 15.5

b) 19

c) 24

d) 9

Solution:

7  , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 15 , 17 , 19 , 21 , 22 , 23 , 25 , 28 , 29 , 29 , 29

Data is in order

20 Data Point

Lower Half 7  , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 15

Upper Half  17 , 19 , 21 , 22 , 23 , 25 , 28 , 29 , 29 , 29

There are 10 points in upper half

Upper Quartile = (5th + 6th)/2

= (23 + 25)/2

= (48)/2

= 24

Upper Quartile  of data is 24

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