Question

A medical checkup was done to ascertain the growth of fifty children in the age group of 10- 16 years in a

housing complex and the height of children was recorded in the form of a table given below.

Height of

children

[in cm]

145-150 150-155 155-160 160-165 165-170 170-175 175-180 Total

Number

of

children

8 4 11 12 8 5 2 50

(i) The number of children having height 165 cm and more, is:

a) 7 b)8 c)13 d) 15

(ii) The class mark of the class 160-165 is:

a) 160 b) 162.5 c) 165 d) 155

(iii) The mean height of children is:

a) 164.4 cm b) 162.8 cm c) 160.6 cm d) 158.7 cm

(iv) Mean of 5 observations is 15. If first, second, third, fourth and fifth observations are increased by 1, 2, 3,

4 and 5 respectively, then the new mean is:

a) 15.5 b) 16 c) 17.5 d) 18
​

Answer 1

Answer:

hi

Step-by-step explanation:

Sorry bro I'm don't know the answer

Answer 2

Answer:

(A) 8+5+2 =15

(B) Upper class limit + Lower class limit

_________________________________

2

Class mark of 160-165= 160+165/2

=325/2

=162.5

(C) 8+4=12