Description
Standard Deviation of Ungrouped and Grouped Data - Discrete and Continuous Distribution
Related Questions VIEW ALL [15]
The mean and standard deviation of marks obtained by 50 students of a class in three subjects, Mathematics, Physics and Chemistry are given below:
Subject |
Mathematics |
Physics |
Chemistry |
Mean |
42 |
32 |
40.9 |
Standard deviation |
12 |
15 |
20 |
Which of the three subjects shows the highest variability in marks and which shows the lowest?
The following is the record of goals scored by team A in a football session:
No. of goals scored |
0 |
1 |
2 |
3 |
4 |
No. of matches |
1 |
9 |
7 |
5 |
3 |
For the team B, mean number of goals scored per match was 2 with a standard deviation 1.25 goals. Find which team may be considered more consistent?
The diameters of circles (in mm) drawn in a design are given below:
Diameters |
No. of children |
33-36 |
15 |
37-40 |
17 |
41-44 |
21 |
45-48 |
22 |
49-52 |
25 |
Find the mean and variance for the data
xi |
92 |
93 |
97 |
98 |
102 |
104 |
109 |
f i |
3 |
2 |
3 |
2 |
6 |
3 |
3 |
Find the mean and variance for the data
xi |
6 |
10 |
14 |
18 |
24 |
28 |
30 |
fi |
2 |
4 |
7 |
12 |
8 |
4 |
3 |