Step Deviation Method
Trending Questions
Q.
Find the mean of the following data, using step-deviation method.
Class | 5−15 | 15−25 | 25−35 | 35−45 | 45−55 | 55−65 | 65−75 |
Frequency | 6 | 10 | 16 | 15 | 24 | 8 | 7 |
Q. The following table shows the marks scored by 80 students in an examination:
Calculate the mean marks correct to 2 decimal places.
Marks | Less than 5 | Less than 10 | Less than 15 | Less than 20 | Less than 25 | Less than 30 | Less than 35 | Less than 40 |
Number of students | 3 | 10 | 25 | 49 | 65 | 73 | 78 | 80 |
Calculate the mean marks correct to 2 decimal places.
Q.
Find the mean of the following frequency distribution using a suitable method.
Class | 20−30 | 30−40 | 40−50 | 50−60 | 60−70 |
Frequency | 25 | 40 | 42 | 33 | 10 |
Q.
Find the mean age of 100 residents of a town from the following data.
Age equal and above (in years)010203040506070Number of persons100907550251550
Q.
Calculate Mean and standard deviation for the following distribution
X | 5 | 15 | 25 | 35 | 45 |
f | 5 | 8 | 15 | 16 | 6 |
Q.
Calculation (i) Arithmetic Mean (ii) Standard Deviation and (iii) Co-efficient of variation for the following frequency distribution.
Class Interval |
Frequency |
30 – 35 35 – 40 40 – 45 45 – 50 50 – 55 |
5 10 16 15 4 |
Total |
50 |