Advertisements
Advertisements
प्रश्न
The harmonic mean of the numbers 2, 3, 4 is:
विकल्प
`12/13`
12
`36/13`
`13/36`
Advertisements
उत्तर
`36/13`
Explanation:
HM = `"n"/(1/"X"_1 + 1/"X"_2 + 1/"X"_3 + ... + 1/"X"_"n")`
Here n = 3
∴ HM = `3/(1/2 + 1/3 + 1/4)`
= `3/((6 + 4 + 3)/12)`
= `3/13 xx 12`
= `36/13`
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 GM for the following table gives the weight of 31 persons in the sample survey.
| Weight (lbs): | 130 | 135 | 140 | 145 | 146 | 148 | 149 | 150 | 157 |
| Frequency | 3 | 4 | 6 | 6 | 3 | 5 | 2 | 1 | 1 |
Calculate AM, GM and HM and also verify their relations among them for the following data.
| X | 5 | 15 | 10 | 30 | 25 | 20 | 35 | 40 |
| f | 18 | 16 | 20 | 21 | 22 | 13 | 12 | 16 |
The median of 10, 14, 11, 9, 8, 12, 6 is
If the mean of 1, 2, 3, …, n is `(6"n")/11`, then the value of n 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.
Answer the following question in about 30 words:
What are the advantages of using mode?
The sum of deviations of all observations from the arithmetic mean of a dataset is always ______.
If each value in a dataset is increased by the same constant, what happens to the mean and median?
A frequency distribution has two classes with the highest and equal frequencies. What can be said about its mode?
