Mathematics
Using short cut method, compute the mean height from the following frequency distribution :
| Height (in cm) | Number of plants |
|---|---|
| 58 | 15 |
| 60 | 14 |
| 62 | 20 |
| 65 | 18 |
| 66 | 8 |
| 68 | 5 |
Related Questions
If the mean of the following observations is 16.6, find the numerical value of p.
Variate (xi) Frequency (fi) 8 12 12 16 15 20 18 p 20 16 25 8 30 4 Find the numerical value of x, if the mean of the following frequency distribution is 12.58.
Variate Frequency 5 2 8 5 10 8 12 22 x 7 20 4 25 2 The number of match sticks contained in 50 match boxes is given below :
Number of match sticks Number of boxes 40 6 42 7 43 12 44 9 45 10 48 6 (i) Using short cut method, find the mean number of match sticks per box.
(ii) How many extra match sticks are to be added to all the contents of 50 match boxes to bring the mean exactly equal to 45 match sticks per box?
The following table gives the marks scored by a set of students in an examination. Calculate the mean of the distribution by using the short cut method.
Marks Number of students 0 – 10 3 10 – 20 8 20 – 30 14 30 – 40 9 40 – 50 4 50 – 60 2