Statistics & Probability
Download Q&AQ. In a lottery, there are 100 tickets, and 10 of them are winning tickets. If one ticket is drawn at random, what is the probability that it is a winning ticket?
Q. In a lottery, there are 100 tickets, and 10 of them are winning tickets. What is the probability of selecting a winning ticket?
Q. In a normal distribution, approximately what percentage of data lies within one standard deviation of the mean?
Q. In a normal distribution, what percentage of data lies within one standard deviation from the mean?
Q. In a normal distribution, what percentage of data lies within one standard deviation of the mean?
Q. In a set of numbers, if the mean is 50 and the sum of the numbers is 400, how many numbers are there?
Q. In a survey, 60% of people like tea, 30% like coffee, and 10% like both. What is the probability that a person likes coffee given that they like tea?
Q. In a survey, 60% of people like tea, and 40% like coffee. If a person is chosen at random, what is the probability that they like coffee given that they do not like tea?
Q. In a survey, 60% of people prefer tea over coffee. If 10 people are surveyed, what is the expected number of people who prefer tea?
Q. In a survey, 60% of people prefer tea over coffee. If 50 people are surveyed, how many prefer tea?
Q. In a survey, 70% of people like chocolate. If 10 people are surveyed, what is the expected number of people who like chocolate?
Q. In a survey, 70% of people like chocolate. If 200 people are surveyed, how many like chocolate?
Q. In a survey, 70% of people like chocolate. If 200 people were surveyed, how many like chocolate?
Q. In a survey, 70% of people like tea and 30% like coffee. If a person is chosen at random, what is the probability that they like tea given that they do not like coffee?
Q. In a survey, 70% of people like tea and 40% like coffee. If 30% like both, what is the probability that a person likes coffee given that they like tea?
Q. In a survey, 70% of people like tea, and 40% like coffee. If 30% like both tea and coffee, what is the probability that a person likes coffee given that they like tea?
Q. In a survey, 70% of people like tea, and 40% like coffee. If 30% like both tea and coffee, what is the probability that a person likes tea given that they like coffee?
Q. In a survey, 70% of people prefer tea over coffee. If 10 people are surveyed, what is the probability that exactly 7 prefer tea?
Q. In a survey, 70% of people prefer tea over coffee. If 10 people are surveyed, what is the expected number of tea drinkers?
Q. In a survey, 70% of people prefer tea over coffee. If 50 people are surveyed, how many prefer tea?
Q. The average of five numbers is 18. If one number is excluded, the average becomes 16. What is the excluded number?
Q. The average of five numbers is 18. If one number is removed, the average becomes 16. What was the removed number?
Q. The interquartile range of the data set: 1, 2, 3, 4, 5, 6, 7, 8 is:
Q. The mean of a data set is 50 and the standard deviation is 5. What is the coefficient of variation?
Q. The median of the data set: 2, 3, 5, 7, 11, 13 is?
Q. The mode of the data set: 1, 2, 2, 3, 4, 4, 4, 5, 5 is?
Q. The range of the data set 1, 3, 5, 7, 9 is:
Q. The range of the data set {10, 15, 20, 25, 30} is?
Q. What is the 75th percentile of the data set {10, 20, 30, 40, 50}?
Q. What is the arithmetic mean of the first five prime numbers?
