Advertisements
Advertisements
प्रश्न
If the mean of 1, 2, 3, …, n is `(6"n")/11`, then the value of n is
विकल्प
10
12
11
13
Advertisements
उत्तर
11
Explanation:
The mean of 1, 2, 3, …., n is `(6"n")/11`
i.e., `(1 + 2 + 3 + 4 + ... + "n")/"n" = (6"n")/11`
`(("n"("n" + 1))/2)/"n" = (6"n")/11`
`("n" + 1)/2 = (6"n")/11`
11 (n + 1) = 2 × 6n
11n + 11 = 12n
∴ n = 11
APPEARS IN
संबंधित प्रश्न
Find lower quartile, upper quartile, 7th decile, 5th decile and 60th percentile for the following frequency distribution.
| Wages | 10 - 20 | 20 - 30 | 30 - 40 | 40 - 50 | 50 - 60 | 60 - 70 | 70 - 80 |
| Frequency | 1 | 3 | 11 | 21 | 43 | 32 | 9 |
Calculate AM, GM and HM from the following data and also find its relationship:
| Marks: | 0 - 10 | 10 - 20 | 20 - 30 | 30 - 40 | 40 - 50 | 50 - 60 |
| No. of students: | 5 | 10 | 25 | 30 | 20 | 10 |
When calculating the average growth of the economy, the correct mean to use is?
Harmonic mean is the reciprocal of _________
The median of 10, 14, 11, 9, 8, 12, 6 is
An investor buys ₹ 1,500 worth of shares in a company each month. During the first four months, he bought the shares at a price of ₹ 10, ₹ 15, ₹ 20 and ₹ 30 per share. What is the average price paid for the shares bought during these four months? Verify your result.
The measure of central tendency that does not get affected by extreme values:
Answer the following question in about 30 words:
Define the mean.
Which type of average is defined as the value repeated the maximum number of times in a dataset?
A frequency distribution has two classes with the highest and equal frequencies. What can be said about its mode?
