Data & Probability — practice questions with answers
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Find the mean of the following data: class marks 10, 30, 50, 70, 90 with corresponding frequencies…A card is drawn at random from a well-shuffled deck of 52 cards. The probability that it is a red…Find the median of the numbers 7, 3, 9, 5, 11, 3.Find the mode of the data: 4, 6, 4, 8, 6, 4, 9, 6, 4.The mean of five numbers is 18. When one number is removed, the mean of the remaining four becomes…The mean of 5 numbers is 18. When one number is removed, the mean of the remaining 4 numbers is…In 200 tosses of a coin, heads appeared 90 times. The empirical probability of getting a tail is:Two fair dice are thrown together. What is the probability that the sum of the numbers shown is 8?Three fair coins are tossed together. What is the probability of getting at least two heads?One card is drawn at random from a well-shuffled pack of 52 playing cards. What is the probability…A bag contains 5 red, 4 green and 3 blue marbles. One marble is drawn at random. What is the…The mean of the five numbers 6, 9, 13, x and 17 is 12. Find the value of x.Find the median of the data 12, 7, 19, 5, 23, 14, 9.A bar chart shows the monthly sales (in units) of Store P: Jan 120, Feb 150, Mar 180, Apr 90, May…A family's monthly budget is drawn as a pie chart with sectors Food 120°, Rent 90°, Education 60°,…Two fair dice are rolled. What is the probability that the product of the two numbers obtained is…A number is chosen at random from the whole numbers 1 to 30. What is the probability that it is a…The mean of 20 observations is 15. If every observation is multiplied by 2 and then 3 is…The mean weight of 25 boys is 48 kg and the mean weight of 15 girls is 40 kg. Find the mean weight…The marks of 40 students are recorded in a frequency table. Marks 10: 5 students, Marks 20: 8…In the frequency distribution Value 2: frequency 4, Value 4: frequency 6, Value 6: frequency f,…Find the mode of the data 4, 6, 7, 6, 9, 6, 4, 7, 4, 6, 8.Two fair dice are thrown. What is the probability of getting at least one six?All the letters of the word LEVEL are arranged at random in a row. What is the probability that…One card is drawn from a well-shuffled pack of 52 playing cards. What is the probability that it…
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