ve
Ex.4: A highway police department conducted a
survey and clocked the speeds of number
of cars on a highway. The following
distribution was obtained:
Number of cars
Speed below
(in kms/hour)
65
19
70
44
99
75
80
85
184
194
90
200
WI
Compute the speed (in kms/hour) below
which 75% cars have their speed.
N
Answers
Given : A highway police department conducted a survey and clocked the speeds of number of cars on a highway.
To Find : the speed (in kms/hour) below which 75% cars have their speed
Solution:
Speed below
(in kms/hour) Number of cars
65 19 19 below 65
70 44 25 65 - 70
75 99 55 70 - 75
80 184 85 75 - 80
85 194 15 80 - 85
90 200 6 85 - 90
75 % of 200 = 150
150 lies in 75 - 80
75 + 5 * ( 150 - 99)/85
= 75 + 3
= 78
78 kms/hour is the speed below which 75% cars have their speed
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