MAT 300 Unit 2 Milestone 2 Exam Answer Sophia Course Many Sets

A fast-food restaurant gave a “Customer Satisfaction Survey” in which 1500 customers rated how satisfied they were with service. The results are shown below as a table. Rating Frequency Extremely Satisfied 234 Satisfied 443 Neutral 246 Dissatisfied 203 Extremely Dissatisfied 374 The relative frequency of people who were dissatisfied with the service is __________.  13.5%  29.5%  20.3%  38.5% 2 The formula for the standard deviation of a sample is: Select the true statement for the following data set that has a mean of 8: 4, 6, 6, 6, 9, 9, 12, 12 Answer choices are rounded to the hundredths place.  The variance is 2.98 and the standard deviation is 8.86.  The variance is 8.86 and the standard deviation is 7.50.  The variance is 8.86 and the standard deviation is 2.98.  The variance is 7.50 and the standard deviation is 2.98. 3 Let x stand for the number of minutes spent waiting in line for a rollercoaster at an amusement park. 81 people are sampled at a time. The sample mean is 18 minutes and the sample standard deviation is 0.5 minutes. What is the standard deviation of the population?  18  4.5  0.5  2 4 Mike's electronics store sold the following number of cellphones on each of the seven days of a week. Day Cell Phones Sold Sunday 12 Monday 10 Tuesday 9 Wednesday 5 Thursday 14 Friday 10 Saturday 10 The mean number of cell phones sold by the store for the week was __________.  5 phones  70 phones  9 phones  10 phones 5 The average daily rainfall for the past week in the town of Hope Cove is normally distributed, with a mean rainfall of 2.1 inches and a standard deviation of 0.2 inches. If the distribution is normal, what percent of data lies between 1.9 inches and 2.3 inches of rainfall?  34%  99.7%  68%  95% 6 Choose the statement that correctly describes a normal distribution.  The approximate percent of values lying within two standard deviations of the mean is 47.5%.  Approximately 68% of the values are greater than the mean value.  The approximate percent of values lying within three standard deviations of the mean is 49.85%.  Approximately 68% of the values lie within one standard deviation of the mean. 7 Hannah noted the height of each student in her class and found that the mean height of the students is 56 inches, with a standard deviation of 1.2 inches. The height of one of the students, James, is 59 inches. What is the z-score for James' height?  -3.6  2.5  3.6  -2.5 8 Jerry graded seven standardized tests with the following scores: 60, 74, 41, 87, 94, 79, 57 Which standardized test score represents the 50th percentile?  57  41  79  74 9 The difference between the standard deviation and the variance of a standard normal distribution is __________.  0  0.5  1  2 10 Which of the following statements about a positively skewed distribution is true?  The distribution of the data tails to the right of the median.  The mean, median, and mode have the same values.  The distribution of the data features two modes.  The distribution of the data tails to the left of the median. 11 Katherine, Jonathan, and Ryan went bowling. Afterwards, two of them decided to make bar graphs to plot their scores. Who made Graph 2, and why?  Katherine, because she wanted to accurately show each person's score.  Katherine, because she wanted to make the scores appear reasonably close.  Jonathan, because he wanted to make the scores appear very different.  Jonathan, because he wanted to make the scores appear reasonably close. 12 Which of the following is NOT a step used in calculating standard deviation?