Mathematics
The following table gives marks scored by students in an examination :
| Marks | Number of students |
|---|---|
| Less than 5 | 3 |
| Less than 10 | 10 |
| Less than 15 | 25 |
| Less than 20 | 49 |
| Less than 25 | 65 |
| Less than 30 | 73 |
| Less than 35 | 78 |
| Less than 40 | 80 |
Calculate the mean marks correct to 2 decimal places.
Related Questions
The weights of 50 apples were recorded as given below. Calculate the mean weight, to the nearest gram, by the step Deviation Method.
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Weights (in gms) Number of eggs 75 – 79 4 80 – 84 9 85 – 89 13 90 – 94 17 95 – 99 12 100 – 104 3 105 – 109 2 Calculate their mean weight to the nearest gm.
The data on the number of patients attending a hospital in a month are given below. Find the average (mean) number of patients attending the hospital in a month by using the shortcut method.
Take the assumed mean as 45. Give your answer correct to 2 decimal places.
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Class-interval Frequency 5 – 15 2 15 – 25 6 25 – 35 4 35 – 45 8 45 – 55 4