The average age of 8 students is 19 years. if the average of first thr

1.	The average age of 8 students is 19 years. if the average of first three students is 20 years and that of last four is 17 years then the age of the fourth student is? 1. 24 years2. 21 years3. 19 years4. 20 years
Answer» Correct Answer - Option 1 : 24 years GIVEN: average of 8 students = 19 years average of first 3 = 20 years average of last 4 = 17 years FORMULA USED: average = sum of all observations/total number of observations CALCULATION: sum of age of all students = 19 × 8 = 152 years sum of age of first 3 = 20 × 3 = 60 sum of age of last 4 = 17 × 4 = 68 age of fourth student = 152 - (60 + 68) = 24 years ∴ age of 4th student is 24 years

The average age of 8 students is 19 years. if the average of first three students is 20 years and that of last four is 17 years then the age of the fourth student is? 1. 24 years2. 21 years3. 19 years4. 20 years

Answer» Correct Answer - Option 1 : 24 years

GIVEN:

average of 8 students = 19 years

average of first 3 = 20 years

average of last 4 = 17 years

FORMULA USED:
average = sum of all observations/total number of observations

CALCULATION:

sum of age of all students = 19 × 8 = 152 years

sum of age of first 3 = 20 × 3 = 60

sum of age of last 4 = 17 × 4 = 68

age of fourth student = 152 - (60 + 68) = 24 years

∴ age of 4th student is 24 years

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The average age of 8 students is 19 years. if the average of first three students is 20 years and that of last four is 17 years then the age of the fourth student is? 1. 24 years2. 21 years3. 19 years4. 20 years

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