Tensile strength of spot welds produced by robot welder

Reference no: EM13337914

The tensile strength of spot welds produced by a robot welder is normally distributed, with a mean of 10,000 pounds per square inch and a standard deviation of 800 pounds per square inch. For a simple random sample if n= 4 welds, what is the probability that the sample mean will be at least 10,200 per square inch? Less than 9900 pounds per square inch?

Reference no: EM13337914

Questions Cloud

Normally distributed with a standard deviation : It has been reported that the average U.S. office worker receives 14 fax messages per day. For purposes of this exercise,we will assume that the daily number of fax messages is normally distributed with a standard deviation of 5.0 messages.

Standard deviation of the corresponding normal distribution : In a certain binomial distribution,π=0.20 and n=30.In using the normal approximation, What are the mean and standard deviation of the corresponding normal distribution?

Describe the probability distribution : Flip a fair coin 50 times, assign a random variable X, where the value of X is equal to the number of heads observed in the flips. Describe the probability distribution of X, and calculate the probability of observing 30 or more heads or more in 50 f..

Population standard deviation : A sample of 60 is used and the population standard deviation is 8.Use the critical value approach to state your conclusion for eachof the following sample results.

Tensile strength of spot welds produced by robot welder : The tensile strength of spot welds produced by a robot welder is normally distributed, with a mean of 10,000 pounds per square inch and a standard deviation of 800 pounds per square inch. For a simple random sample if n= 4 welds, what is the probabil..

Number of ralphs purchases that have been stolen : A city lae-enforcement official has stated that 20% ofthe items sold by pawn shops within the city have been stolen.Ralph has just purchased 4 items from one of the city's pawn shops.

Possibilities exist for the eventual display : A roadside museum has 25 exhibits but enough space to display only 10 at a time. If the order of arrangement is considered,how many possibilities exist for the eventual display?

How many different combinations of the clients : An investment counselor would like to meet with 12 of his clients on Mondays,but he has time for only 8 appointments. How many different combinations of the clients could be considered for inclusion into his limited schedule for that day?

Construction of an expensive home requires : A contractor must pay a 40,000 penalty if construction of an expensive home requires more than 16 weeks. He will receive a bonus of 10,000 if the home is completed within 8 weeks.

User Account

All Pages