The following are some particulars of the distribution of weights of boys and girls in a class:   Boys Girls Number 100 50 Mean 60kg 45kg Variance 9 4 Which of the distributions is more variable?

In a class of 40 students, 45% are girls. Find the number of boys in the class .

The total number of ways in which 4 boys and 4 girls can form a line, with boys and girls alternating, is

Which of the following collections are sets? All boys in your class weighing less than 50 kg.

The following values are calculated in respect of heights and weights of the students of a section of class XI: Height Weight Mean 162.6 cm 52.36 kg Variance 127.69cm2 23.1361 kg2 Can we say that the weights show greater variation than the heights?

Find the mean and variance of the random variable X which follows the following distribution.

The mean weight of 150 students in a certain class is 60 kg. The mean weight of boys is 70 kg and that of girls in the class is 55 kg. Find the number of boys and girls in the class.

The number of boys and girls in a class are in the ratio 7:5. The number of boys is 8 more than the number of girls. What is the total class strength?

Number of ways arranging 4 boys and 5 girls if between two particular girls there is exactly two boys.

The following is the distribution of weights (in kg) of 52 persons: Weight in kg, Persons 30-40 40-50 50-60 60-70 70-80, 10 15 17 6 4 What is the lower limit of class 50-60? Find the class marks of the classes 40-50, 50-60 What is the class size?

The means and standard deviations of heights ans weights of 50 students of a class are as follows: Weights Heights Mean 63.2 kg 63.2 inch Standard deviation 5.6 kg 11.5 inch Which shows more variability, heights or weights?