Practice Questions on Mean for Ungrouped Data :
Here we are going to see some practice questions on mean for ungrouped data.
Question 1 :
In a week, temperature of a certain place is measured during winter are as follows 26oC, 24oC, 28oC, 31oC, 30oC, 26oC, 24oC. Find the mean temperature of the week.
= Sum of all temperature / Number of terms
= (26 + 24 + 28 + 31 + 30 + 26 + 24) / 7
Hence the mean temperature is 27 oC.
Question 2 :
The mean weight of 4 members of a family is 60 kg. Three of them have the weight 56 kg, 68 kg and 72 kg respectively. Find the weight of the fourth member.
Let "x" be the weight of fourth member.
Mean weight of 4 members = 60 kg
(56 + 68 + 72 + x)/4 = 60
196 + x = 60(4)
x = 240 - 196
x = 44 kg
Hence the required weight of fourth member is 44 kg.
Question 3 :
In a class test in mathematics, 10 students scored 75 marks, 12 students scored 60 marks, 8 students scored 40 marks and 3 students scored 30 marks. Find the mean of their score.
Number of students scored 75 marks = 10
Number of students scored 60 marks = 12
Number of students scored 40 marks = 8
Number of students scored 30 marks = 3
= [10(75) + 12(60) + 8(40) + 3(30)] / (10 + 12 + 8 + 3)
= (750 + 720 + 320 + 90) / 33
Question 4 :
In a research laboratory scientists treated 6 mice with lung cancer using natural medicine. Ten days later, they measured the volume of the tumor in each mouse and given the results in the table
= (145 + 148 + 142 + 141 + 139 + 140) / 6
= 142.5 mm3
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