Question

hi friends pls just answer 4th question pls​

Answer 1

Answer:

the answer is

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

mean=sum of observation/no.of observation

1)(1/2+3)/2=(7/2)/2=7/4

2)(3/4+1/3)/2=(13/12)2=13/24

3)(-7/2+5/4)/2=(-9/4)/2=-9/8

4)(-8/5+7/9)/2=(-37/45)/2=-37/90