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# Savannah

Questions0
• ### Thompson and Thompson is a steel bolts manufacturing company. Their current steel bolts have a mean diameter of 138 millimeters, and a ?

Thompson and Thompson is a steel bolts manufacturing company. Their current steel bolts have a mean diameter of 138 millimeters, and a standard deviation of 5 millimeters.

If a random sample of 41 steel bolts is selected, what is the probability that the sample mean would be less than 137.3 millimeters? Round your answer to four decimal places.

• ### Suppose a large shipment of laser printers contained 18% defectives. If a sample of size 340 is selected?

Suppose a large shipment of laser printers contained 18% defectives.

If a sample of size 340 is selected, what is the probability that the sample proportion will be greater than 13%? Round your answer to four decimal places.

• ### A study on the latest fad diet claimed that the amounts of weight lost by all people on this diet had a mean of 20.7 pounds ?

A study on the latest fad diet claimed that the amounts of weight lost by all people on this diet had a mean of 20.7 pounds and a standard deviation of 4.1 pounds.

Step 1 of 2 : If a sampling distribution is created using samples of the amounts of weight lost by 90 people on this diet, what would be the mean of the sampling distribution of sample means? Round to two decimal places, if necessary.

• ### PLZ Help! I am confused. The mean monthly car payment for  123 residents of the local apartment complex is \$624. ?

The mean monthly car payment for  123 residents of the local apartment complex is

\$624. What is the best point estimate for the mean monthly car payment for all residents of the local apartment complex?

Mathematics2 months ago
• ### Hello, Can anyone please explain how to find the critical value? ?

Hello, Can anyone please explain how to find the critical value? For example z0.01= 1.28, how do you find the 1.28? The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day. They would like the estimate to have a maximum error of 0.13 gallons. A previous study found that for an average family the standard deviation is 1.3 gallons and the mean is 18.5 gallons per day. If they are using a 98% level of confidence, how large of a sample is required to estimate the mean usage of water? Round your answer up to the next integer.

• ### Please Help! The mean life of a television set is  96 months with a variance of  225. ?

The mean life of a television set is  96 months with a variance of  225.

If a sample of  76 televisions is randomly selected, what is the probability that the sample mean would be greater than   94.7 months? Round your answer to four decimal places.

• ### Urgent, Help! The head of maintenance at XYZ Rent-A-Car believes that the mean number of miles between services is  4178 miles ?

The head of maintenance at XYZ Rent-A-Car believes that the mean number of miles between services is  4178 miles, with a variance of  124,609.

If he is correct, what is the probability that the mean of a sample of

40 cars would be less than 4265

• ### Please Help! The operation manager at a tire manufacturing company believes that the mean mileage of a tire is  44,111 miles?

The operation manager at a tire manufacturing company believes that the mean mileage of a tire is  44,111 miles, with a variance of  5,943,844. What is the probability that the sample mean would be less than  44,257 miles in a sample of  80 tires if the manager is correct? Round your answer to four decimal places.

• ### Please help!A production manager at a wall clock company wants to test their new wall clocks.The designer claims they have a mean life of 14?

A production manager at a wall clock company wants to test their new wall clocks.  The designer claims they have a mean life of  14  years with a variance of  25.

If the claim is true, in a sample of  50 wall clocks, what is the probability that the mean clock life would be greater than  12.5 years? Round your answer to four decimal places.

• ### Please help. The cost of  5 gallons of ice cream has a variance of  64 with a mean of  34 dollars during the summer. ?

The cost of  5 gallons of ice cream has a variance of  64 with a mean of  34 dollars during the summer.

What is the probability that the sample mean would differ from the true mean by more than  1.1 dollars if a sample of  38  5-gallon pails is randomly selected? Round your answer to four decimal places.

• ### PLZ HELP! Determine whether or not to give in procedure result in a binomial distribution. ?

surveying 40 people to determine which brand of soft drink is their favorite.

Yes no no

• ### Suppose that diameters of a new species of Apple have a bell shaped distribution with a mean of 7.25cm. And a standard deviation of 0.42?

What percentage of the apples have diameters that are less than 6.41cm

• ### Plz help. Suppose that grade point averages of undergraduate students at one university have a bell shaped distribution with a mean of 2.52?

A psychology professor assigns letter grades on a test according to the following scheme.

A: Top 8% of scores

B: Scores below the top 8% and above the bottom 61%

C: Scores below the top 39% and above the bottom 16%

D: Scores below the top 84% and above the bottom 8%

F: Bottom 8% of scores

Scores on the test are normally distributed with a mean of 65.4 and a standard deviation of 9.7 Find the numerical limits for a D grade. Round your answers to the nearest whole number, if necessary.

A psychology professor assigns letter grades on a test according to the following scheme.

A:  Top  11% of scores

B:  Scores below the top 11% and above the bottom  55%

C:  Scores below the top  45% and above the bottom 20%

D:  Scores below the top  80% and above the bottom  9%

F:  Bottom  9% of scores

Scores on the test are normally distributed with a mean of 71.9  and a standard deviation of  8.4

Find the minimum score required for an A grade.  Round your answer to the nearest whole number, if necessary.

A humanities professor assigns letter grades on a test according to the following scheme.

A:  Top  6% of scores

B:  Scores below the top  6%  and above the bottom  64%

C:  Scores below the top  36% and above the bottom  17%

D:  Scores below the top  83%  and above the bottom  8%

F:  Bottom  8% of scores

Scores on the test are normally distributed with a mean of 76.9 and a standard deviation of  9.5. Find the numerical limits for a C grade.  Round your answers to the nearest whole number, if necessary.