Question 1 :
In a week, temperature of a certain place is measured during winter are as follows 26^{o}C, 24^{o}C, 28^{o}C, 31^{o}C, 30^{o}C, 26^{o}C, 24^{o}C. Find the mean temperature of the week.
Solution :
Mean temperature
= Sum of all temperature / Number of terms
= (26 + 24 + 28 + 31 + 30 + 26 + 24) / 7
= 189/7
= 27
Hence the mean temperature is 27 ^{o}C.
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.
Solution :
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.
Solution :
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
= 1880/33
= 56.96
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
Solution :
= (145 + 148 + 142 + 141 + 139 + 140) / 6
= 855/6
= 142.5 mm^{3}
Kindly mail your feedback to v4formath@gmail.com
We always appreciate your feedback.
©All rights reserved. onlinemath4all.com
Oct 30, 24 10:07 AM
Oct 29, 24 06:24 AM
Oct 29, 24 06:23 AM