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प्रश्न
A study of the yield of 150 tomato plants, resulted in the record:
| Tomatoes per Plant | 1 - 5 | 6 - 10 | 11 - 15 | 16 - 20 | 21 - 25 |
| Number of Plants | 20 | 50 | 46 | 22 | 12 |
What is the frequency of the class preceding the modal class?
उत्तर
| Tomatoes per Plant | Mid-Point (x) | Number of Plants (f) | fx |
| 1 - 5 | 3 | 20 | 60 |
| 6 - 10 | 8 | 50 | 400 |
| 11 - 15 | 13 | 46 | 598 |
| 16 - 20 | 18 | 22 | 396 |
| 21 - 25 | 23 | 12 | 276 |
| Total | 150 | 1730 |
The frequency of the class preceding the modal class is 20.
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संबंधित प्रश्न
The following data gives the information on the observed lifetimes (in hours) of 225 electrical components:
| Lifetimes (in hours) | 0 − 20 | 20 − 40 | 40 − 60 | 60 − 80 | 80 − 100 | 100− 120 |
| Frequency | 10 | 35 | 52 | 61 | 38 | 29 |
Determine the modal lifetimes of the components.
Compare the modal ages of two groups of students appearing for an entrance test:
| Age (in years): | 16-18 | 18-20 | 20-22 | 22-24 | 24-26 |
| Group A: | 50 | 78 | 46 | 28 | 23 |
| Group B: | 54 | 89 | 40 | 25 | 17 |
Find the mean, median and mode of the following data:
| Classes: | 0-20 | 20-40 | 40-60 | 40-60 | 80-100 | 100-120 | 120-140 |
| Frequency: | 6 | 8 | 10 | 12 | 6 | 5 | 3 |
Heights of students of class X are givee in the flowing frequency distribution
| Height (in cm) | 150 – 155 | 155 – 160 | 160 – 165 | 165 – 170 | 170 - 175 |
| Number of students | 15 | 8 | 20 | 12 | 5 |
Find the modal height.
Also, find the mean height. Compared and interpret the two measures of central tendency.
Find the mode of the following distribution:
| Class interval |
10 – 14 | 14 – 18 | 18 – 22 | 22 – 26 | 26 – 30 | 30 – 34 | 34 – 38 | 38 – 42 |
| Frequency | 8 | 6 | 11 | 20 | 25 | 22 | 10 | 4 |
If the mode of the data: 64, 60, 48, x, 43, 48, 43, 34 is 43, then x + 3 =
Find the mode of the following data:
| Marks | 0 − 10 | 10 − 20 | 20 − 30 | 30 − 40 | 40 − 50 |
| Number of students | 22 | 38 | 46 | 34 | 20 |
Construction of a cumulative frequency table is useful in determining the ______.
The mode of the following data is:
| xi | 10 | 14 | 18 | 21 | 25 |
| fi | 10 | 15 | 7 | 9 | 9 |
250 apples of a box were weighed and the distribution of masses of the apples is given in the following table:
| Mass (in grams) |
80 – 100 | 100 – 120 | 120 – 140 | 140 – 160 | 160 – 180 |
| Number of apples |
20 | 60 | 70 | x | 60 |
Find the modal mass of the apples.
