Question

the scores of 48 children in intelligence test are shown in the followings
score._ frequency
71 _ 4
76. _ 3
79. _ 4
83. _5
86._ 6
89. _5
92._ 4
97_. 4
101. _3
103_ 3
107_ 3
110_ 2
114_ 2

calculate the variance

Answer 1

first we hve to find mean
4+3+4+5+6+5+4+4+3+3+3+2+2/13 =48/13
=3.6
thn find x
4-3.6= 0.4
3-3.6=-0.6
4-3.6=0.4
5-3.6=1.4
6-3.6=2.4
5-3.6=1.4
4-3.6=0.4
4-3.6=0.4
3-3.6=-0.6
3-3.6=-0.6
3-3.6=-0.6
2-3.6=-1.6
2.3.6=-1.6