Advertisements
Advertisements
Question
The following are weights (in kg) of 12 people.
70, 62, 54, 57, 62, 84, 75, 59, 62, 65, 78, 60.
- Find the mean of the weights of the people.
- How many people weigh above the mean weight?
- Find the range of the given data.
Advertisements
Solution
a. The weights of 12 persons are 70, 62, 54, 57, 62, 84, 75, 59, 62, 65, 78 and 60.
Sum of weights of 12 people
= 70 + 62 + 54 + 57 + 62 + 84 + 75 + 59 + 62 + 65 + 78 + 60
= 788
Number of observations (persons) = 12
∴ Mean = `"Sum of all observations (weight of 12 persons)"/"Number of observations"`
= `788/12`
= 65.66
b. Weights above 65.66 are 70, 84, 75 and 78, i.e. 4 persons.
c. Range = Maximum observation – Minimum observation
= 84 – 54
= 30
APPEARS IN
RELATED QUESTIONS
The` "n"^(th)` term of the A. P. 3, 8, 13, 18, ............ is 148. Find n
In a week, temperature of a certain place is measured during winter are as follows 26°C, 24°C, 28°C, 31°C, 30°C, 26°C, 24°C. Find the mean temperature of the week
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
| Mouse marking | 1 | 2 | 3 | 4 | 5 | 6 |
| Tumor Volume (mm3) | 145 | 148 | 142 | 141 | 139 | 140 |
Find the mean
If the mean of the following data is 20.2, then find the value of p
| Marks | 10 | 15 | 20 | 25 | 30 |
| No. of students | 6 | 8 | p | 10 | 6 |
If the average selling price of 15 books is ₹ 235, then the total selling price is __________
Ages of 15 students in 8th standard is 13, 12, 13, 14, 12, 13, 13, 14, 12, 13, 13, 14, 13, 12, 14. Find the mean age of the students
The marks of 14 students in a science test out of 50 are given below. 34, 23, 10, 45, 44, 47, 35, 37, 41, 30, 28, 32, 45, 39 Find the maximum mark obtained
Let x, y, z be three observations. The mean of these observations is ______.
Which measures of central tendency get affected if the extreme observations on both the ends of a data arranged in descending order are removed?
The mean age of 25 teachers in a school is 40 years. A teacher retires at the age of 60 years and a new teacher is appointed in his place. If the mean age of the teachers in this school now is 39 years, then the age (in years) of the newly appointed teacher is ______.
