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प्रश्न
In a malaria epidemic, the number of cases diagnosed were as follows:
| Date July | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Num | 5 | 12 | 20 | 27 | 46 | 30 | 31 | 18 | 11 | 5 | 0 | 1 |
On what days do the mode and upper and lower quartiles occur?
उत्तर
| Date | Number | C.f. |
| 1 | 5 | 5 |
| 2 | 12 | 17 |
| 3 | 20 | 37 |
| 4 | 27 | 64 |
| 5 | 46 | 110 |
| 6 | 30 | 140 |
| 7 | 31 | 171 |
| 8 | 18 | 189 |
| 9 | 11 | 200 |
| 10 | 5 | 205 |
| 11 | 0 | 205 |
| 12 | 1 | 206 |
(i) Mode = 5th July as it has maximum frequencies.
(ii) Total number of terms = 206
Upper quartile = `206 xx 3/4`
= 154.5th term
= 7th July
Lower quartile = `206 xx 1/4`
= 51.5th term
= 4th July
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संबंधित प्रश्न
The marks of 200 students in a test were recorded as follows:
| Marks | No. of students |
| 10-19 | 7 |
| 20-29 | 11 |
| 30-39 | 20 |
| 40-49 | 46 |
| 50-59 | 57 |
| 60-69 | 37 |
| 70-79 | 15 |
| 80-89 | 7 |
Construct the cumulative frequency table. Drew the ogive and use it too find:
(1) the median and
(2) the number of student who score more than 35% marks.
Draw a histogram for the following distribution and estimate the mode:
| I.Q. Score | 80-100 | 100-120 | 120-140 | 140-160 | 160-180 | 180-200 |
| No. of Students | 6 | 9 | 16 | 13 | 4 | 2 |
Find the median of:
233, 173, 189, 208, 194, 204, 194, 185, 200 and 220.
Find the mean of squares of first five whole numbers.
The mean of marks scored by 100 students was found to be 40, later on, it was discovered that a score of 53 was misread as 83. Find the correct mean.
Find the mean and the median of: 10,12, 12, 15, 15, 17, 18, 18, 18 and 19
Find the median of the following sets of numbers.
15, 8, 14, 20, 13, 12, 16
The median of the data: 3, 4, 5, 6, 7, 3, 4 is ______.
The marks in a subject for 12 students are as follows:
31, 37, 35, 38, 42, 23, 17, 18, 35, 25, 35, 29
For the given data, find the median
An incomplete frequency distribution is given below
| Variate | Frequency |
| 10 – 20 | 12 |
| 20 – 30 | 30 |
| 30 – 40 | ? |
| 40 – 50 | 65 |
| 50 – 60 | 45 |
| 60 – 70 | 25 |
| 70 – 80 | 18 |
| Total | 229 |
Median value is 46, the missing frequency is:
