Average
- Average monthly income of a family of 4 earning members was Rs. 735. One of the earning members died and therefore, the average income came down to Rs 650. The income of the deceased was?
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Income of the deceased = Total income of 4 members - total income of remaining 3 members.
= 735 x 4 - 650 x 3 Rs.Correct Option: C
Income of the deceased = Total income of 4 members - total income of remaining 3 members.
= 735 x 4 - 650 x 3 Rs.
= 990 Rs.
- The average age of 24 students in a class is 10. If the teacher’s age is included, the average increase by one . The age of the teacher is ?
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Age of the teacher = Sum of age of 24 students and teacher - Sum of age of 24 students.
= 25 x 11 - 24 x 10
= 35 years.Correct Option: C
Age of the teacher = Sum of age of 24 students and teacher - Sum of age of 24 students.
= 25 x 11 - 24 x 10
= 35 years.
∴ Age of teacher = 35 years.
- The average expenditure of a man for the first five month is Rs. 120 and for the next seven months it is Rs . 130. if he saves Rs 299 in that year, his monthly average income is ?
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Total income = total expenditure + total saving
= Rs. (120 X 5 + 130 X 7 + 290)
=Rs. 1800Correct Option: B
Total income = total expenditure + total saving
= Rs. (120 X 5 + 130 X 7 + 290)
=Rs. 1800
Average monthly income
=1800 / 12
=150 Rs.
- The average salary of 20 workers in an office id Rs. 1900 per month . If the manger’s salary is added , the average salary become Rs. 2000 p.m what is the manager’s annual salary ?
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Manager's salary per month
= Rs. (21 x 2000 - 20 x 1900)
= Rs. 4000Correct Option: D
Manager's salary per month
= Rs. ( 21 x 2000 - 20 x 1900 )
= Rs. 4000
∴ Manager 's annual salary
= Rs. (4000 X 12 ) = Rs. 48000.
- The average of 6 observation is 12. A new 7th observation is included and the new average is decrease by 1 , the seventh observation is ?
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Seventh observation = sum of 7 observations - sum of 6 observations = 7 x 11 – 6 x 12
Correct Option: C
Seventh observation = sum of 7 observations - sum of 6 observations = 7 x 11 – 6 x 12
= 5