The number of hours of computer usage in a day of a random sample of 12 students was recorded as follows: 4.7, 3.9, 4.7, 4.8, 5.7, 6.1, 5.7, 5.3, 4.1, 3.1, 3.7, 4.0 What is the standard deviation of the number of hours of computer usage?
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- In a math class of 60 students, the mean general average of the students at the end of the semester is 57 with a standard deviation of 4. Assuming that the scores are normally distributed, how many would pass if the passing score is 50? A. 60 B. 57 C. 30 D. 473. The amount of time that a drive-through bank teller spends on a customer is a random variable with a mean 3.2 minutes and a standard deviation of 1.6 minutes. If a random sample of 64 customers is observed, find the probability that their mean time at the teller’s window is: a. at most 2.7 minutes; b. more than 3.5 minutes; c. at least 3.5 minutes but less than 3.4 minutes.You are to write down on a piece of paper the number of credits you are taking this semester. Your instructor will then collect the data and share the results with the class. Calculate the mean and standard deviation of the data. Assuming a normal distribution, determine the probability that a student is taking between 12 to 15 credits this semester. What is the probability that a student is taking less than 12 credits?
- The search time for a parking stall follows a normal distribution with a mean of 12.0 minutes and a standard deviation of 2.5 minutes. What is the probability that a driver is not able to find a parking stall in 15 minutes? Group of answer choices 0.316 0.885 0.385 0.115The scores of a test for an engineering class of 30 students are shown here. Organize the data in a manner similar to Table 19.1 and use Excel to create a histogram. Scores: 57, 94, 81, 77, 66, 97, 62, 86, 75, 87, 91, 78, 61, 82, 74, 72, 70, 88, 66, 75, 55, 66, 58, 73, 79, 51, 63, 77, 52, 84A Civil engineering student is taking Calculus 2 and Engineering Data Analysis courses. The probability that he will pass Calculus 2 and Engineering Data Analysis is 2/3 and 4/9, respectively. What is the probability that he will pass both courses if the probability of passing at least one course is 4/5.
- How large a sample is needed to estimate the population mean for the amount of money a person spends on Christmas presents within $4 and be 80% confident? The standard deviation of the population is $6.50GIVEN DATA: a) level of significance = 0.125, 0.24, 0.31b) confidence level = 95%, 77%, 98% a. What are the levels of confidence in a)? Separate answers with a comma, express in 3 decimal places. Ex: 1.000,1.000,1.000 b. What are the levels of significance in b)? Separate answers with a comma, express in 3 decimal places. Ex: 1.000,1.000,1.000Please answer with 9 results
- An electric company reported the annual number of kilowatt hours expended byvarious home appliances. It is claimed that a dishwasher expends an average of 46 kilowatt hours peryear. If a random sample of 12 homes indicates that dishwashers expend an average of 42-kilowatthours per year with a standard deviation of 11.9 kilowatt hours, does this suggest at a 0.05 significancelevel that dishwashers expend, on average, less than 46 kilowatt hours annually? Assume the populationof kilowatt hours to be normalFor Problem 19.1, using Equations (19.1) and (19.6), calculate the mean and standard deviation of the class scores.The next time you make a trip to a supermarket, ask the manager if you can measure the mass of at least 10 cereal boxes of your choice. Choose the same brand and the same size boxes. Tell the manager this is an assignment for a class. Report the average mass, variance, and standard deviation for the cereal boxes. Does the manufacturer’s information noted on the box fall within your measurement? Repeat Problem using three other products, such as cans of soup, tuna, or peanuts.