Find the average of all prime numbers between 30 and 50.
37.8
38.9
39.8
42.8
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1
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Find the average of 205, 302, 108, 403, and 202
Solution 
2
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The average score of a cricketer for ten matches is 38.9 runs. If the average for the first six matches is 42, then find the average for the last four matches.
Solution 
3
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The average height of 30 boys out of a class of 50 is 160 cm. If the average height of the remaining boys is 165 cm, the average height of the whole class (in cm) is :
Solution 
4
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3 years age, the average age of a family of 5 members was 17 years. A baby having been born, the average age of the family is same today. The present age of the baby is :
Solution 
5
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The average of x number is y and average of y numbers is x. Then the average of all the numbers taken together is
Solution 
6
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The average of 10 items was found to be 80 but while calculating, one of the items was counted as 60 instead of 50. Then the correct average would have been :
Solution 
7
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The average of six numbers is x and the average of three of these is y. If the average of the remaining three is z, then
Solution 
8
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A cricketer whose bowling average is 12.4 runs per wicket takes 5 wickets for 26 runs and thereby decreased his average by 0.4. The number of wickets taken by him the last match was
Solution 
9
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If the mean of a,b,c is M and ab+bc+ca=0, then the mean of a^{2},b^{2},c^{2} is:
Solution 
10
Discuss

The average age of a family of 10 members is 20 years. If the age of the youngest member of the family is 10 years, then the average age of the members of the family just before the birth of the youngest member was approximately.
Solution 
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