Class Interval | Frequency (fi) | Class Mark (xi) | fi.xi |
0-10 | 6 | 5 | 30 |
10-20 | 10 | 15 | 150 |
20-30 | 9 | 25 | 225 |
30-40 | 4 | 35 | 140 |
40-50 | 11 | 45 | 495 |
Summing up:
Σfi = 6 + 10 + 9 + 4 + 11 = 40
Σfi. xi = 30 + 150 + 225 + 140 + 495 = 1040
Arithmetic Mean (x̄) = Σfi .xi / Σfi = 1040 / 40 = 26
English
200 Questions
200 Marks
120 Mins English English20 Questions20 Marks15 Mins English English200 Questions200 Marks120 Mins EnglishThe mean marks of boys in a class is 52 and that of girls is 42. The mean marks of boys and girls combined is 50. The percentage of boys in the class is:
The mean of the probability distribution of the number obtained on throwing a die having 1 on three faces, 2 on two faces, and 5 on one face is:
What is the mean of the following distribution?
The arithmetic mean of the observations 28, 31, 40, 63, 57, 37, 34, 70 and 99 is:
Correct relation for the numbers 10, 7, 8, 5, 6, 8, 5, 8, 6 is:
If mean of a variable X is M, then mean of variable Y = (X – 4)/5 will be:
What is the mean of the following distribution?
Marks | 12 | 22 | 58 | 79 | 89 |
No. of Students | 98 | 74 | 17 | 28 | 44 |
The arithmetic mean of the observations 83, 17, 62, 87, 62, 96, 86, 92 and 90 is:
What is the mean of the following distribution?
Marks | 13 | 27 | 59 | 61 | 97 |
No. of Students | 95 | 57 | 80 | 98 | 73 |
The mode and median of a data set is 89.7 and 32, respectively. What is the mean of the data set? (Use empirical formula.)
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