can someone help me with those question?
idk how to find z
The accompanying frequency table shows the heights (in inches) of 130 members of a choir. a) Find the median and IQR. b) Find the sample mean and sample standard deviation. c) Display these data with a histogram. d) Write a few sentences describing the distribution of heights. Click the icon to view the frequency table of heights of choir members. Frequency Table of Heights of Choir Members X Height | Count 60 61 62 63 64 4 65 18 66 19 68 13 69 70 11 71 7 72 11 73 74 75 er. 76 NOWWThe stem-and-leaf display shows the number of home runs hit by Mark during the 1986 - 1999 seasons. Describe the distribution, mentioning its shape and any unusual features. The key for the stem-and-leaf display is 7 | 7 = 77. Is the distribution uniform, unimodal, or bimodal? O A. The distribution is uniform. B. The distribution is unimodal. O C. The distribution is bimodal. Is the stem-and-leaf display symmetric or skewed? O A. The distribution is symmetric. O B. The distribution is skewed to the right. C. The distribution is skewed to the left. The center of the distribution is in the 40s . The number of home runs per season ranged from a low of home runs to a high of home runs.An incoming MBA student took placement exams in economics and mathematics. In economics, she scored 83 and in math 89. The overall results on the economics exam had a mean of 73 and a standard deviation of 10, while the mean math score was 67, with a standard deviation of 10. On which exam did she do better compared with the other students? Since she scored standard deviations the mean in economics and standard deviations the mean in mathematics, she did better on the exam. (Round to two decimal places as needed.) below aboveA man recorded the speeds of cars driving past his house. where the speed limit was 20 mph. The mean of 100 readings was 23.79 mph wilh a standard deviation of 3.68 mph. {He actually recorded every car for a two-month period. These are 100 representative readings.) a} How many standard deviations from the mean would a car going the speed limit be? h) Which would be more unusual, a car traveling 35 mph or one going 9 mph? Some IQ tests are standardized to a Normal model M10114). What IQ would be considered to be unusually high? Explain. Select the correct choice below and ll in the answer boxes within your choice. [Type integers or decimals. Do not round.) 0A. OB. QC. Any IO score more than 1 standard deviation above the mean, or greater than D is unusually high. One would expect to see an IQ score 2 standard deviations above the mean. or greater than El, only rarely. Any IQ score more than 3 standard deviations above the mean, or greater than deviation above the mean, or greater than , only rarely. Any IO score more titan 2 standard deviations above the mean, or greater than deviations above the mean. or greater than El only rarely. , is unusually high. One would expect to see an IQ score 1 standard , is unusually high. One would expect to see an IQ score 3 standard Use the Normal model \"[1 [10,1 E} describing IQ scores to anewer the following. a] What percent of people's IDs are expected to be over ES? b] What percent of people's IDs are expected to be under 95'? c} What pereent of people's IGe are expected to be between 121 and 135'? Use the Normal model N(1134,65) for the weights of steers. a) What weight represents the 55th percentile? b) What weight represents the 90th percentile? c) What's the IQR of the weights of these steers?Use the Normal model N(99,12) for the IQs of sample participants. a) What IQ represents the 15th percentile? b) What IQ represents the 96th percentile? c) What's the IQR of the IQs
