Average Questions Practice Question and Answer
8Q: The average value found for 20 observations was 75. It was noticed later that 97 was read as 79. So, what was the correct average value? 1507 05d19e0457619fe30b9d34a66
5d19e0457619fe30b9d34a66- 175.7false
- 275.8false
- 375.9true
- 475.6false
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Answer : 3. "75.9"
Explanation :
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Q: The average of 20 numbers is 32. If two numbers are 29 and 31, then what is the average of the remaining numbers (correct up to two decimals)?
1500 064abdcbb299b7896000b4560
64abdcbb299b7896000b4560- 131.24false
- 230.22false
- 334.44false
- 432.22true
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Answer : 4. "32.22"
Q: There are 40 boys in a class and average age of the class is 16 years. A boy of 17 years of age is replaced by another one, as a result average age becomes 15.875 years. Find the age of the new boy? 1489 05d19d6201388cd24f0860eff
5d19d6201388cd24f0860eff- 112 yearstrue
- 214.5 yearsfalse
- 315 yearsfalse
- 417 yearsfalse
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Answer : 1. "12 years"
Explanation :
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Q: Average age of 12 men is 56 years. Two members of 60 years and 52 years die. What will the average age of the remaining members? 1472 05d19cf5a1388cd24f0860eef
5d19cf5a1388cd24f0860eef- 154 yearsfalse
- 255 yearsfalse
- 356 yearstrue
- 458 yearsfalse
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Answer : 3. "56 years "
Explanation :
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Q: 16 children are to be divided into two group A and B consisting of 10 and 6 children. The average percent marks obtained by the children of Group A is 75 and the average percent marks of all the 16 children is 76. What is the average percent marks of children of Group B?
1471 05f5afb19dc518b408a418a15
5f5afb19dc518b408a418a15- 1false
- 2false
- 3false
- 4true
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Answer : 4. "
Q: The twice of sum of the ages of a father and his son is 8 times the age of the son. If the average age of the father and the son is 30 years, what is father's age ? 1462 05b5cc6c9e4d2b4197774df83
5b5cc6c9e4d2b4197774df83- 142 yrsfalse
- 245 yrstrue
- 336 yrsfalse
- 438 yrsfalse
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Answer : 2. "45 yrs"
Explanation :
Answer: B) 45 yrs Explanation: Let father's age be x year and son's age be y year. According to question, 2(x+y) = 8y _______(I) and (x+y)/2 = 30 => x+y = 60 years__________(II) From equation (I) and (II) 8 y = 120 y = 15 years, Hence x = 45 years.
Q: What is the average of the following numbers?
38, 92, 45, 25, 60
1460 05da059f500e22578c9e9a658
5da059f500e22578c9e9a65838, 92, 45, 25, 60
- 148false
- 254false
- 356false
- 450false
- 5None of thesetrue
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Answer : 5. "None of these"
Q: When the average age of husband, wife and their son was 42 years, the son got married and a child was born just one year after marriage. When the child turned to be 5 years, the average age of the family becomes 36 years. What was the age of daughter-in-law at the time of marriage?
1459 05f2cfeaebe9f31290fb86c32
5f2cfeaebe9f31290fb86c32- 124 yearfalse
- 228 yearfalse
- 330 yearfalse
- 425 yeartrue
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