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प्रश्न
The mean of a discrete frequency distribution xi / fi, i = 1, 2, ......, n is given by
विकल्प
`overlineX = (sum f_ix_i)/(sumf_i)`
\[\frac{1}{n} \sum^n_{i = 1} f_i x_i\]
\[\frac{\sum^n_{i = 1} f_i x_i}{\sum^n_{i = 1} x_i}\]
\[\frac{\sum^n_{i = 1} f_i x_i}{\sum^n_{1 = 1} i}\]
उत्तर
The mean of discrete frequency distribution is
`overlineX = (sum f_ix_i)/(sumf_i)`
Hence, the correct option is (a).
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संबंधित प्रश्न
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The monthly consumption of electricity (in units) of some families of a locality is given in the following frequency distribution:
| Monthly Consumption (in units) | 140 – 160 | 160 – 180 | 180 – 200 | 200 – 220 | 220 – 240 | 240 – 260 | 260 - 280 |
| Number of Families | 3 | 8 | 15 | 40 | 50 | 30 | 10 |
Prepare a ‘more than type’ ogive for the given frequency distribution.
What is the lower limit of the modal class of the following frequency distribution?
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The following frequency distribution gives the monthly consumption of electricity of 64 consumers of locality.
| Monthly consumption (in units) | 65 – 85 | 85 – 105 | 105 – 125 | 125 – 145 | 145 – 165 | 165 – 185 |
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The following table gives the life-time (in days) of 100 electric bulbs of a certain brand.
| Life-tine (in days) | Less than 50 |
Less than 100 |
Less than 150 |
Less than 200 |
Less than 250 |
Less than 300 |
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If \[u_i = \frac{x_i - 25}{10}, \Sigma f_i u_i = 20, \Sigma f_i = 100, \text { then }\]`overlineX`
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| Class: | 0-5 | 6-11 | 12-17 | 18-23 | 24-29 |
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For the following distribution:
| C.I. | 0 - 5 | 6 - 11 | 12 - 17 | 18 - 23 | 24 - 29 |
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the upper limit of the median class is?
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| More than or equal to 80 | 4 |
| More than or equal to 70 | 6 |
| More than or equal to 60 | 11 |
| More than or equal to 50 | 17 |
| More than or equal to 40 | 23 |
| More than or equal to 30 | 27 |
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| More than or equal to 10 | 32 |
| More than or equal to 0 | 34 |
