RD Sharma Solutions Chapter 7 Statistics Exercise 7.2 Class 10 Maths
Chapter Name  RD Sharma Chapter 7 Statistics 
Book Name  RD Sharma Mathematics for Class 10 
Other Exercises 

Related Study  NCERT Solutions for Class 10 Maths 
Exercise 7.2 Solutions
1. The number of telephone calls received at an exchange per interval for 250 successive one  minute intervals are given in the following frequency table :
No. of calls (x) 
0 
1 
2 
3 
4 
5 
6 
No. of intervals (f) 
15 
24 
29 
46 
54 
43 
39 
Solution
Let be assumed mean (A) = 3
2. Five coins were simultaneously tossed 1000 times, and at each toss the number of heads was observed. The number of tosses during which 0,1,2,3,4 and 5 heads were obtained are shown in the table below. Find the mean number of heads per toss
No. of heads per toss(x): 
0 
1 
2 
3 
4 
5 
No. of tosses (f): 
38 
144 
342 
287 
164 
25 
Solution
No. of branches (x): 
2 
3 
4 
5 
6 
No. of plants(f): 
49 
43 
57 
38 
13 
Calculate the average number of branches per plant.
Solution
No. of children(x): 
0 
1 
2 
3 
4 
5 
No. of families(f): 
10 
21 
55 
42 
15 
7 
Solution
Marks(x): 
15 
20 
22 
24 
25 
30 
33 
38 
45 
Frequency(f): 
5 
8 
11 
20 
23 
18 
13 
3 
1 
Find the average number of marks.
Solution
No. of students absent(x): 
0 
1 
2 
3 
4 
5 
6 
7 
No. of days(f): 
1 
4 
10 
50 
34 
15 
4 
2 
Find the mean number of students absent per day.
Solution
No. of misprints per page (x) 
0 
1 
2 
3 
4 
5 
No. of pages(f); 
154 
95 
36 
9 
5 
1 
Find the average number of misprints per page.
Solution
No. of accidents(x): 
0 
1 
2 
3 
4 
No. of workers(f): 
70 
52 
34 
3 
1 
Find the average number of accidents per worker.
Solution
Marks(x): 
5 
10 
15 
20 
25 
30 
35 
40 
45 
50 
No. of students(f): 
15 
50 
80 
76 
72 
45 
39 
9 
8 
6 
Solution