Post-UTME Mathematics 2015 Objective — Question 6
Question 6 of 40 from the Post-UTME Screening (Post-UTME) Mathematics 2015 Objective paper, with the correct answer and a full explanation.
Advertisement
The weekly earnings of each of five brothers were 100 naira, 120 naira, 125 naira, 150 naira and 110 naira. Find the variance of the weekly earning.
- A. 200
- B. 250
- C. 282
- D. 284Correct
Explanation
Mean = 605/5 = 121. Deviations: -21,-1,4,29,-11. Squared: 441,1,16,841,121, sum=1420. Variance = 1420/5 = 284.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.