Advertisements
Advertisements
प्रश्न
Arithmetic mean of 15 observations was calculated as 85. In doing so an observation was wrongly taken as 73 for 28. What would be correct mean?
उत्तर
Arithmetic mean = `"Sum of all observations"/"Number of observations"`
85 = `"Sum of 15 observations"/15`
85 × 15 = sum of 15 observations
1275 = sum of 15 observations
Wrong observation = 73
Correct observation = 28
∴ Correct Mean = `"Sum − Wrong value + Correct value"/"Number of observations"`
= `(1275 - 73 + 28)/15`
= `(1202 + 28)/15`
= `1230/15`
= 82
Correct mean = 82
APPEARS IN
संबंधित 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?
If `barx` is the mean of x1, x2 ............xn and `bary` is the mean of y1, y2, …….yn and `barz` is the mean of x1, x2 ............xn, y1, y2, ……….yn then `barz` =?
Find the common difference of the A.P 3, 5, 7, ..........
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 mean of a set of seven numbers is 81. If one of the numbers is discarded, the mean of the remaining numbers is 78. The value of discarded number is
The mean of 5, 9, x, 17 and 21 is 13, then find the value of x
If the average selling price of 15 books is ₹ 235, then the total selling price 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
