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प्रश्न
Find the mean of: 3, 1, 5, 4, 4 and 7
उत्तर
Mean of 3, 1, 5, 4, 4 and 7
Required mean = `"Sum of data values"/"No. of. data values"`
`= (3 + 1 + 5 + 4 + 4 + 7)/6`
`= 24/6 = 4`
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संबंधित प्रश्न
Draw a histogram from the following frequency distribution and find the mode from the graph:
| Class | 0-5 | 5-10 | 10-15 | 15-20 | 20-25 | 25-30 |
| Frequency | 2 | 5 | 18 | 14 | 8 | 5 |
Marks obtained by 40 students in a short assessment is given below, where a and b are two missing data.
| Marks | 5 | 6 | 7 | 8 | 9 |
| Number of Students | 6 | a | 16 | 13 | b |
If the mean of the distribution is 7.2, find a and b.
The following table gives the weekly wages of workers in a factory.
| Weekly wages (Rs) | No. of workers |
| 50 – 55 | 5 |
| 55 – 60 | 20 |
| 60 – 65 | 10 |
| 65 – 70 | 10 |
| 70 – 75 | 9 |
| 75 – 80 | 6 |
| 80 – 85 | 12 |
| 85 – 90 | 8 |
Calculate the mean by using:
Short-cut method
The daily wages of 80 workers in a building project are given below :
| Wages (Rs) | No.of workers |
| 30-40 | 6 |
| 40-50 | 10 |
| 50-60 | 15 |
| 60-70 | 19 |
| 70-80 | 12 |
| 80-90 | 8 |
| 90-100 | 6 |
| 100-110 | 4 |
Using graph paper, draw an ogive for the above distribution. Use your ogive, to estimate :
(1) the mediam wages of workers
(2) the percentage of workers who earn more than Rs 75 a day.
(3) the upper quartile wages of the workers
(4) the lower quartile wages of the workers
(5) Inter quartile range
A mathematics aptitude test of 50 students was recored as follows:
| Marks | No. of students |
| 50-60 | 4 |
| 60-70 | 8 |
| 70-80 | 14 |
| 80-90 | 19 |
| 90-100 | 5 |
Draw a histrogram for the above data using a graph paper and locate the mode.
Estimate the median, the lower quartile and the upper quartile of the following frequency distribution by drawing an ogive:
| Class Interval | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 |
| Frequency | 4 | 12 | 21 | 18 | 15 | 7 | 3 |
Find the median of:
241, 243, 347, 350, 327, 299, 261, 292, 271, 258 and 257
Find the median of the data: 24, 36, 46, 17, 18, 25, 35
The median class for the given distribution is:
| Class Interval | 1 - 5 | 6 - 10 | 11 - 15 | 16 - 20 |
| Cumulative Frequency | 2 | 6 | 11 | 18 |
A die was thrown 15 times and the outcomes recorded were 5, 3, 4, 1, 2, 6, 4, 2, 2, 3, 1, 5, 6, 1, 2. Find the mean, median and mode of the data.
