Question

i) Percentage of people in the range 149.5 -159.5cm is equal to ______.

ii) Percentage difference between the number of people in the range 159.5 - 169.5cm and 169.5 - 179.5cm is____.

• A. 30 , 16.66 %
• B. 20 , 6.66%
• C. 20 , 16.66 %
• D. 30 , 6.66 %

Answer 1

The correct option is D

30 , 6.66 %

i) Total number of people in the height range 149.5 – 159.5 cm = 9

Total number of people = 30

Percentage of people in the height range 149.5 – 159.5 cm
= $\frac{9}{30}\times 100=30$ %

ii) Number of people in the height range 159.5-169.5 cm = 7

Number of people in the height range 169.5-179.5 cm = 5

$\therefore$ Difference between the above ranges = 7-5 = 2

Percentage difference between 159.5 – 169.5 cm and 169.5 – 179.5 cm
= $\frac{2}{30}\times 100=6.66$%