For 50 students with mean score 60 and variance 25, the coefficient of variation (sigma/mean × 100%):
A5%
B8.33%
C20%
D41.67%
Answer & Solution
Correct answer: B. 8.33%
sigma = sqrt(25) = 5. CV = (5/60) × 100% = 8.33%. Useful for comparing variability of distributions with different means.
Related questions
Two coins tossed. P(both heads) =Bag has 4 red, 6 blue. P(red) =Probability of rolling 6 on a die:Probability of heads on a fair coin is:If a fair six-sided die is rolled twice, the probability that the sum is divisible by 3 isA bag has 3 red and 2 black balls. Probability of red ball drawn at random:Probability of getting an even number on rolling a single die:Probability of drawing a king from a standard deck of 52 cards: