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
Following table shows the points of each player scored in four games:
| Player | Game 1 | Game 2 | Game 3 | Game 4 |
| A | 14 | 16 | 10 | 10 |
| B | 0 | 8 | 6 | 4 |
| C | 8 | 11 | Did not play | 13 |
Now answer the following questions:
- Find the mean to determine A’s average number of points scored per game.
- To find the mean number of points per game for C, would you divide the total points by 3 or by 4? Why?
- B played in all the four games. How would you find the mean?
- Who is the best performer?
There are 40 students in a class, out of them 15 are boys. The mean of marks obtained by boys is 33 and that for girls is 35. Find out the mean of all students in the class.
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
The mean of a, b, c, d and e is 28. If the mean of a, c and e is 24, then mean of b and d is
The mean of first ten natural numbers is ____________
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 minimum mark obtained
Find the mean and mode of 6, 11, 13, 12, 4, 2
Mean of the data is always from the given data.
Mean of the observations can be lesser than each of the observations.
The following are weights (in kg) of 12 people. 70, 62, 54, 57, 62, 84, 75, 59, 62, 65, 78, 60. How many people weigh above the mean weight?
