Mat 201 Basic Statistics
1. In a poll, respondents were asked whether they had ever been in a car accident. 157 respondents indicated that they had been in a car accident and 117 respondents said that they had not been in a car accident. If one of these respondents is randomly selected, what is the probability of getting someone who has been in a car accident?
157+117=274/157=1.74
2. The data set represents the income levels of the members of a country club. Find the probability that a randomly selected member earns at least $88,000
2/20=10 percent
3. In a certain class of students, there are 15 boys from Wilmette, 5 girls from Kenilworth, 9 girls from Wilmette, 6 boys from Glencoe, 2 boys from Kenilworth and 8 girls from Glencoe. If the teacher calls upon a student to answer a question, what is the probability that the student will be from Kenilworth?
.159 = 16 percent
4. Find the probability of correctly answering the first 2 questions on a multiple choice test if random guesses are made and each question has 5 possible answers.
2/5 = .4 = 20 percent
5. Of 1936 people who came into a blood bank to give blood, 220 people had high blood pressure. Estimate the probability that the next person who comes in to give blood will have high blood pressure.
8.8 percent
1. Last year, nine employees of an electronics company retired. Their ages at retirement are listed below. Find the mean retirement age. 57+62+62+55+66+58+65+50+50=525/9=58.3=58 mean retirement age
2. A store manager kept track of the number of newspapers sold each week over a seven-week period. The results are shown below. 36 30 201 180 278 242 310
Find the median number of newspapers sold.
30,36,180,201,242,278,310 = 201 median number of newspapers sold
3. Last year, nine employees of an electronics company retired. Their ages at retirement are listed below. 52 65
157+117=274/157=1.74
2. The data set represents the income levels of the members of a country club. Find the probability that a randomly selected member earns at least $88,000
2/20=10 percent
3. In a certain class of students, there are 15 boys from Wilmette, 5 girls from Kenilworth, 9 girls from Wilmette, 6 boys from Glencoe, 2 boys from Kenilworth and 8 girls from Glencoe. If the teacher calls upon a student to answer a question, what is the probability that the student will be from Kenilworth?
.159 = 16 percent
4. Find the probability of correctly answering the first 2 questions on a multiple choice test if random guesses are made and each question has 5 possible answers.
2/5 = .4 = 20 percent
5. Of 1936 people who came into a blood bank to give blood, 220 people had high blood pressure. Estimate the probability that the next person who comes in to give blood will have high blood pressure.
8.8 percent
1. Last year, nine employees of an electronics company retired. Their ages at retirement are listed below. Find the mean retirement age. 57+62+62+55+66+58+65+50+50=525/9=58.3=58 mean retirement age
2. A store manager kept track of the number of newspapers sold each week over a seven-week period. The results are shown below. 36 30 201 180 278 242 310
Find the median number of newspapers sold.
30,36,180,201,242,278,310 = 201 median number of newspapers sold
3. Last year, nine employees of an electronics company retired. Their ages at retirement are listed below. 52 65