Advertisements
Advertisements
Question
The mean of five numbers is 50, out of which mean of 4 numbers is 46, find the 5th number:
Options
4
20
434
66
Advertisements
Solution
Since, the mean of five numbers is 50, out of which mean of 4 numbers is 46
So, the 5th number
= Sum of 5th Observation - Sum of 4th Observations
= (50 × 5) - (46 × 4)
= 250 - 184
= 66
APPEARS IN
RELATED QUESTIONS
Find the mean of the first five whole numbers.
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 35 observations is 20, out of which mean of first 18 observations is 15 and mean of last 18 observation is 25. Find the 18th observation.
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` =?
Mean of 100 observations is 40. The 9th observation is 30. If this is replaced by 70 keeping all other observations same, find the new mean.
The following table shows the number of saplings planted by 30 students. Fill in the boxes and find the average number of saplings planted by each student.
| No. of saplings (Scores) xi |
No. of students (frequency) fi |
fi x xi |
| 1 | 4 | 4 |
| 2 | 6 | `square` |
| 3 | 12 | `square` |
| 4 | 8 | `square` |
| N = `square` | ∑fixi = `square` |
Mean `bar "x"` = `square/"N"`
= `square/square`
= `square`
∴ The average number of trees planted `square`
Find the common difference of the A.P 3, 5, 7, ..........
A batsman scored the following number of runs in six innings: 36, 35, 50, 46, 60, 55. Calculate the mean runs scored by him in an inning.
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 algebraic sum of the deviations of a set of n values from their mean is
If the mean of five observations x, x + 2, x + 4, x + 6, x + 8, is 11, then the mean of first three observations is
The average of two numbers are 20. One number is 24, another number is ____________
The mean of the data 12, x, 28 is 18. Find the value of x
Find the mean of first 10 prime numbers and first 10 composite numbers
The mean of a data is defined as ______.
Mean of the observations can be lesser than each of the observations.
Find the mean of the first ten even natural numbers.
Find the mean of first six multiples of 4.
In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72, then what is the average of the girls?
