Average of 1^3 +2^3 +...+5^3 is MCQ with Answer and Explanation

Average of 1^3 +2^3 +...+5^3 is

A. 225

B. 55

C. 50

D. 45

Answer: Option D

Sum cubes =(5*6/2)^2=225. Average=225/5=45.

This question belongs to: Maths Average

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Question #1 Report Error

Average of five consecutive odd numbers is 25. What is the largest number?

A. 31

B. 27

C. 29

D. 33

Correct Answer: Option C

Explanation:
Let numbers be x-4, x-2, x, x+2, x+4. Average = x = 25. Largest = 25 + 4 = 29.

This question belongs to: Maths Average

Question #2 Report Error

Average weight of 20 girls 45 kg. If 5 boys average 55 kg included, new average for 25?

A. 46

B. 48

C. 50

D. 47

Correct Answer: Option D

Explanation:
Girls 900. Boys 275. Total 1175/25=47.

This question belongs to: Maths Average

Question #3 Report Error

The average of 55,65,75,85 is

A. 65

B. 70

C. 75

D. 72

Correct Answer: Option B

Explanation:
280/4=70.

This question belongs to: Maths Average