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Problem 1: Find mean, variance and standard deviation of 1,3,4,5,6,6,10
Problem 2: Find mean, variance and standard deviation for the following frequency distribution table
X
5
15
25
35
45
55
65
75
F
3
7
9
23
8
6
4
Problem 3: Show that if x‾ is mean of the values xi with weight fi(i = 1, 2, 3....n), then ∑i=1nfi(xi - x‾) = 0.
Problem 4: Find median from the following data
Class
Frequency
10-25
25-40
20
40-55
40
55-70
26
70-85
85-100
2
Problem 5: Calculate the mode of the following distribution
Number of grains
100-110
110-130
130-140
140-160
160-170
170-180
Number of plants
11
27
34
12
Problem 6: Find mean deviation from the following data
30,40,70,20,60,50,10
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