Advertisements
Advertisements
प्रश्न
The calculated mean of 50 observations was 80. It was later discovered that observation 19 was recorded by mistake as 91. What was the correct mean?
उत्तर
Mean = `"The sum of all observations"/"Total number of observations"`
∴ The sum of all observations = Mean x Total number of observations
∴ The sum of 50 observations = 80 x 50
= 4000
Sum of observations after correction = 4000 + 19 – 91
= 3928
∴ Corrected mean = `"Sum of observations after correction"/"Total number of observations"`
= `3928/50`
= 78.56
∴ The corrected mean is 78.56.
APPEARS IN
संबंधित प्रश्न
The mean is one of the numbers in a data.
Solve any two of the following.
In some families in a colony the daily purchase of milk in litre is 1, 3, 2, 2, 4, 1, 2, 2, 1. Find the mean, median and mode of daily purchase of milk.
The mean of five numbers is 50, out of which mean of 4 numbers is 46, find the 5th number:
Find the common difference of the A.P 3, 5, 7, ..........
Find the mean of first six multiples of 3.
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 |
The average of the marks 2, 9, 5, 4, 4, 8, 10 is ____________
The mean height of 11 students in a group is 150 cm. The heights of the students are 154 cm, 145 cm, Y cm, Y + 4 cm, 160 cm, 151 cm, 149 cm, 149 cm, 150 cm, 144 cm and 140 cm. Find the value of Y and the heights of two students?
Find the mean and mode of 6, 11, 13, 12, 4, 2
