Use the following table to answer questions 1 and 2: Light colors Dark colors Vibrant colors Female 20 22 28 Male 10 30 8 1. Find the probability that a randomly chosen person is male or prefers light colors. a. 68/118 b. 10/118 c. 10/48 d. 48/118 2. Find the probability that a randomly chosen person is male given that he prefers dark colors. a. 30/48 b. 30/118 c. 30/52 d. 22/118
Use the following table to answer questions 1 and 2: Light colors Dark colors Vibrant colors Female 20 22 28 Male 10 30 8 1. Find the probability that a randomly chosen person is male or prefers light colors. a. 68/118 b. 10/118 c. 10/48 d. 48/118 2. Find the probability that a randomly chosen person is male given that he prefers dark colors. a. 30/48 b. 30/118 c. 30/52 d. 22/118
Use the following table to answer questions 1 and 2: Light colors Dark colors Vibrant colors Female 20 22 28 Male 10 30 8 1. Find the probability that a randomly chosen person is male or prefers light colors. a. 68/118 b. 10/118 c. 10/48 d. 48/118 2. Find the probability that a randomly chosen person is male given that he prefers dark colors. a. 30/48 b. 30/118 c. 30/52 d. 22/118
Use the following table to answer questions 1 and 2: Light colors Dark colors Vibrant colors Female 20 22 28 Male 10 30 8 1. Find the probability that a randomly chosen person is male or prefers light colors. a. 68/118 b. 10/118 c. 10/48 d. 48/118 2. Find the probability that a randomly chosen person is male given that he prefers dark colors. a. 30/48 b. 30/118 c. 30/52 d. 22/118 Let X = number of siblings. Use the following table to answer questions 3 and 4: x P(x) 0 2/40 1 5/40 2 3 14/40 4 7/40 5 4/40 3. Find the probability that a person has two siblings. a. 8/40 b. 8 c. 2 d. 6/40 4. Find the expected number of siblings a person has. a. 2.78 b. 15 c. 3.13 d. 1.0 Use the following table to answer question 5: Running Time School Average Running Time School Standard Deviation Kia 4.9 5.2 0.15 Alejandra 4.2 4.6 0.25 Iris 4.5 4.9 0.12 5. Which person is the fastest runner relative to her school? a. Alejandra b. Kia c. Tie between Alejandra and Kia d. Iris 6. Suppose that the lifespan of a laptop battery is normally distributed with a mean of 2500 hours and a standard deviation of 60 hours. What is the probability that a randomly chosen battery will last at most 2560 hours? a. 0.1587 b. 0.8413 c. 0.6539 d. 0.3461 7. A random sample of 123 college professors were surveyed to determine the proportion who owned a pet. 86 reported owning pets. Construct a 98% confidence interval for the true population proportion of college professors who own a pet. a. (0.6181, 0.7802) b. (0.6030, 0.7954) c. (0.6312, 0.7672) d. (0.5927, 0.8057) 8. The population proportion of college professors who own a pet is an example of a: a. parameter. b. statistic. c. variable. d. population. 9. A sorority only accepts sisters who have a GPA in the top one percent of students. Suppose that GPA at their university is normally distributed with a mean of 2.5 and a standard deviation of 0.5. What is the minimum GPA necessary to become a sister in the sorority? a. 1.34 b. 3.99 c. 3.66 d. 3.00
Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.
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