7..- V V ' 7' myopenmathcom C l l V r ' 7 -- 0 Question 6 v The results of a common standardized test used in psychology research is designed so that the population mean is 175 and the standard deviation is 10. A subject earns a score of 156. What is the z-score for this raw score? Do not round your answer. Question Help: El Video @ Written Example 8 Message instructor Submit Question Jump to Answer 30/1 pt '05 34 Details myopenmath.com The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have a mean of 50 ounces and a standard deviation of 5 ounces. Use the Standard Deviation Rule, also known as the Empirical Rule (see image below). Do not use normalcdf on your calculator. Suggestion: sketch the distribution in order to answer these questions. a) 99.7% of the widget weights lie between ' I and ' ] b) What percentage of the widget weights lie between 40 and 65 ounces? :] % c) What percentage of the widget weights lie above 45 ? :] 96 Question Help: El Video @ Written Example 8 Message instructor Jumpmnswer myopenmath.com C Question 8 0/1 pt 95 2 4 0 Details The time to complete an exam is approximately Normal with a mean of 50 minutes and a standard deviation of 4 minutes. The bell curve below represents the distribution for testing times. The scale on the horizontal axis is equal to the standard deviation. Fill in the indicated boxes. H = 50 0= 4 H - 30 -20 Hto H + 20 H+30 0000 0 0O Question Help: Written Example Message instructor Submit Question Jump to Answer7 : ,, ED 7 myopenmathcom O , ' , ] , l , . Question 10 v a 0/1 pt 0 5 3 4 Details Suppose that the speed at which cars go on the freeway is normally distributed with mean 80 mph and standard deviation 8 miles per hour. Let X be the speed for a randomly selected car. a. What is the distribution of x2 x - Ni:],:]) b. If one car is randomly chosen, find the probability that it is traveling more than 77 mph. Round to 4 decumal places. C] c. If one of the cars is randomly chosen, find the probability that it is traveling between 83 and 88 mph. Mund to 4 decimal places. C] Question Help: [3 Written Example 8 Message instructor Submit Question Jump to