answer this question
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Answered by
3
Answer:
50
Step-by-step explanation:
add all the terms and divide by 4 and equate it by 20
you will get the ans
Answered by
1
Answer:
average=sum of observation/no. of obsv.
20 =5+10+15+x/4
20×4=30+x
80-30=x
50=x
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