Statistics and Probability

Data representation, mean/median/mode, introduction to probability.

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Q1 · Statistics and Probability · EASY
The marks obtained by 10 students in a mathematics test are: 45, 50, 55, 60, 65, 65, 70, 75, 80, 85. What is the median mark?
Q2 · Statistics and Probability · MEDIUM
A coin is tossed twice. What is the probability of getting at least one head?
Q3 · Statistics and Probability · MEDIUM
The mean of five numbers is 24. If one number is excluded, the mean of the remaining four numbers becomes 22. What is the excluded number?
Q4 · Statistics and Probability · EASY
The following data shows the number of books read by 20 students in a month: 2, 3, 3, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 7, 7, 8, 8, 9, 9, 10. What is the mode of this data?
Q5 · Statistics and Probability · MEDIUM
A bag contains 5 red balls, 3 blue balls and 2 green balls. If one ball is drawn at random, what is the probability that it is NOT blue?