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Syllabus

6. Find the median weight for the following data:

Find the mean lifetime of electricity tubes.

Q7. The mean of 5 numbers is 20. If one number is excluded, mean of the remaining numbers becomes 23. Find the excluded number.

Q8. The mean of 25 observations is 27. If one observation is included, the mean still remains 27. Find the included observation.

Q9. The mean of 5 observations is 15. If the mean of first three observations is 14 and that of the last three is 17, find the third observation.

2)find the mean of the first seven odd prime numbers

-Repeating the question:-

"Answer the ICSE board question(2018).

CHAPTER :STATISTICS

(b) If the mean of he following distribution is 24 , find the value of

'a'

$\begin{array}{cccccc}Marks& 0-10& 10-20& 20-30& 30-40& 40-50\\ NumberofStudents& 7& a& 8& 10& 5\end{array}\phantom{\rule{0ex}{0ex}}$

A sum exceeding 12

A doublet

Sum of two numbers as an even number

Q(a). The ogive of the distribution of marks of 45 students is given below. Find mean by using step deviation method.

(b) The daily expenditure of 100 families are as follows :

_{1}_{2}_{3}Daily mean expenditure per family is Rs. 188. Find f

_{1}and f_{2}.(c) Calculate mean, median and mode of the following distribution :

1) the value of x;

2) the mean of first three observations.

(i) increased by 3

(ii) decreased by 7

(iii) multiplied by 2

An ace

The 10 hearts

A black card

Draw a cumulative frequency table.

30, 32, 24, 34, 26, 28, 30, 35, 33, 25

(i) Show that the sum of the derivations of all the given observations from the mean is zero.

(ii) Find the median if the given data.