RD Chapter 24 Measures of Central Tendency Ex 24.1 Solutions
Question - 1 : - If the heights of 5 persons are 140 cm, 150 cm, 152 cm, 158 cm and 161 cm respectively. Find the mean height.
Answer - 1 : -
Heights of 5 persons are 140 cm, 150 cm, 152 cm, 158 cm and 161 cm
Question - 2 : - Find the mean of 994, 996, 998, 1002 and 1000.
Answer - 2 : - Mean of 994, 996, 998, 1002 and 1000
Question - 3 : - Find the mean of first five natural numbers.
Answer - 3 : -
First five natural numbers are 1, 2, 3, 4, 5
Question - 4 : - Find the mean all factors of 10.
Answer - 4 : - Factors of 10 = 1, 2, 5, 10
Question - 5 : - Find the mean of first 10 even natural numbers.
Answer - 5 : - First 10 even natural numbers are 2, 4, 6, 8, 10, 12, 14, 16, 18, 20
Question - 6 : - Find the mean of x, x + 2, x + 4, x + 6, x + 8.
Answer - 6 : - Sum = x + x + 2+ x + 4 + x + 6 + x + 8 = 5x + 20
Question - 7 : - Find the mean of first five multiples of 3.
Answer - 7 : - First 5 multiples of 3 are = 3, 6, 9, 12, 15
Question - 8 : - Following are the weights (in kg) or 10 new born babies in a hospital on a particular day:
3.4, 3.6, 4.2, 4.5, 3.9, 4.1, 3.8, 4.5, 4.4, 3.6. Find the mean 
Answer - 8 : - Weights of 10 new bom babies are 3.4, 3.6, 4.2, 4.5, 3.9, 4.1, 3.8, 4.5, 4.4, 3.6
Question - 9 : - The percentage of marks obtained by students of a class in mathematics are : 64, 36, 47, 23, 0, 19, 81, 93, 72, 35, 3, 1. Find their mean.
Answer - 9 : - Percentage of 12 students are 64, 36, 47, 23, 0, 19, 81, 93, 72, 35, 3, 1
Question - 10 : - The numbers of children in 10 families of a locality are : 2, 4, 3, 4, 2, 0, 3, 5, 1, 1, 5. Find the mean number of children per family.
Answer - 10 : - Number of children in 10 families are 2, 4, 3, 4, 2, 0, 3, 5, 1, 1, 5