Statistics & Probability
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Q. A bag contains 4 white and 6 black balls. If one ball is drawn at random, what is the probability that it is not black?
Q. A bag contains 4 white balls and 6 black balls. If one ball is drawn at random, what is the probability that it is not black?
Q. A bag contains 4 white balls and 6 black balls. If one ball is drawn at random, what is the probability that it is black?
Q. A bag contains 4 white, 3 black, and 5 red balls. If one ball is drawn at random, what is the probability that it is not black?
Q. A bag contains 4 white, 5 black, and 6 red balls. If one ball is drawn at random, what is the probability that it is not black?
Q. A bag contains 5 red balls and 3 blue balls. What is the probability of drawing a red ball? (2022)
Q. A box contains 10 balls numbered from 1 to 10. What is the probability of drawing a ball with an even number?
Q. A box contains 10 balls, 4 of which are red. If one ball is drawn at random, what is the probability that it is red? (2020)
Q. A box contains 10 balls, 4 of which are white. If one ball is drawn at random, what is the probability that it is not white? (2022)
Q. A box contains 10 balls, of which 4 are red and 6 are blue. If one ball is drawn, what is the probability that it is not red?
Q. A box contains 10 balls, of which 4 are white and 6 are black. If one ball is drawn at random, what is the probability that it is black?
Q. A box contains 10 balls, of which 4 are white and 6 are black. If one ball is drawn, what is the probability that it is black?
Q. A box contains 10 balls, of which 4 are white and 6 are black. If one ball is drawn at random, what is the probability that it is white?
Q. A box contains 10 light bulbs, of which 3 are defective. If one bulb is selected at random, what is the probability that it is not defective?
Q. A box contains 3 red balls and 2 blue balls. If one ball is drawn at random, what is the probability that it is red?
Q. A box contains 3 red, 5 blue, and 2 green balls. If one ball is drawn at random, what is the probability that it is blue?
Q. A box contains 5 red balls and 3 blue balls. What is the probability of drawing a red ball? (2021)
Q. A class has 30 students with an average score of 75. If 5 new students join with an average score of 80, what is the new average? (2023)
Q. A class has 30 students with an average score of 75. If a new student joins and the average becomes 76, what is the score of the new student? (2023)
Q. A class has an average score of 75. If one student scored 90, what is the average score of the remaining students if there are 20 students in total?
Q. A class has the following scores in a test: 56, 78, 78, 82, 82, 82, 90, 91. What is the mode of the scores?
Q. A class of 30 students has an average score of 75. If one student scores 90, what will be the new average? (2022)
Q. A class of students scored the following marks: 45, 50, 50, 55, 60, 60, 60, 70, 75. What is the mode of the scores?
Q. A class of students scored the following marks: 45, 55, 55, 60, 60, 60, 70, 75, 80. What is the mode of the scores?
Q. A class of students scored the following marks: 45, 55, 55, 60, 60, 60, 70, 75. What is the mode of the scores?
Q. A class of students scored the following marks: 45, 55, 55, 60, 70, 70, 70, 80, 90. What is the mode of the scores?
Q. A coin is tossed three times. What is the probability of getting at least one head?
Q. A data set has a mean of 20 and a variance of 16. What is the range of the data if it is normally distributed? (2023)
Q. A data set has a mean of 20 and a variance of 16. What is the range of the data if the maximum value is 28? (2023)
Q. A data set has a mean of 50 and a variance of 25. What is the standard deviation? (2021)
