Question

159
0.
Measures of Central Tendency
The mean weight of 100 students in a certain class is 59 kg. The mean
weight of boys in the class is 65 kg and that of girls is 50 kg. Find the
number of boys and girls in the class.
(T.US2050)
(b) The mean weight of 150 students in a certain class is 60 kg. The mean
weight of boys in the class is 70 kg and that of girls is 55 kg. Find the
number of boys and the number of girls in the class.
(a) The mean age of a combined group of men and women is 30 years. If the
mean age of the group of men is 32 years and that of the group of women is
27 years, find out the percentage of the men and women in the group.
(b) The mean monthly salary paid to all employees in a certain company is
Rs. 600. The mean monthly salaries paid to the male and female employees
were Rs. 620 and Rs. 520 respectively. Obtain the percentage of male to
female employees in the company.
(a) The pass result of 40 students who took up a class test is given below:
Marks: 4 5 6 7 8 9​

Answer 1

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