A company services home air conditioners. It is known that times for service calls follow a...
A company services home air conditioners. It is known that times for service calls follow a normal distribution with a mean of 60 minutes and a standard deviation of 10 minutes. A random sample of seven service calls is taken.
What is the probability that exactly two of them take more than 68.4 minutes? For calculation convenience, you may round probability results to the nearest thousandth (3 decimals).
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A company services home air conditioners. It is known that times
for service calls follow a...
A company services home air conditioners. It is know that times for service calls follow a...
A company services home air conditioners. It is know that times for service calls follow a normal distribution with a mean of 60 minutes and a standard deviation of 10 minutes. d) Find the shortest range of times that includes 50% of all service calls. e) A random sample of four service calls is taken. what is the probability that exactly two of them take more than 65 minutes? Thank you!
A company repairs air conditioners. The time it takes to repair them is known to follow...
A company repairs air conditioners. The time it takes to repair them is known to follow a normal distribution that has an average of 14 minutes and a standard deviation of 8.3 minutes. Find the probability that your air conditioner will be repaired in 20.2914 minutes. You can use EXCEL, TI, R or the Table to answer this question. Select one: a The probability that the air conditioning will be repaired in 20.3 minutes is 95% b. The probability that...
Question 5. A lahmacun company has found that service times for orders follow a normal distribution...
Question 5. A lahmacun company has found that service times for orders follow a normal distribution with a mean of 40 minutes and a standard deviation of 10 minutes. A random sample of five orders was taken. a) The probability is 0.2 that the sample mean of service times is less than how many minutes? (10 pts) b) What is the probability that more than one of these orders take more than 60 minutes? (10 pts)
1. The owner of automobile towing services company knows that the number of towing service calls...
1. The owner of automobile towing services company knows that the number of towing service calls the company makes each day is a random variable have approximately normal distribution with the mean 36.2 and standard deviation 5.1. What are the probabilities that in any given day the company will make: a. Exactly 30 towing service calls b. At most 30 towing service calls
Question number-2: Run times at a local marathon are known to follow a left-skewed distribution with...
Question number-2: Run times at a local marathon are known to follow a left-skewed distribution with a mean of 244 minutes and a standard deviation of 109 minutes. If we select a random sample of 57 people, what is the probability that the average run time of this sample will be between 226.675 minutes and 269.987 minutes?
The distribution of times that a company's service technicians take to respond to trouble calls is...
The distribution of times that a company's service technicians take to respond to trouble calls is normal with mean μ and standard deviation 0.25 hours. The company advertises that its service technicians take an average of 2 hours to respond to trouble calls from customers. We suspect that the average time is really more than 2 hours. From a random sample of 25 trouble calls, the average time service technicians took to respond was 2.10 hours. How strong is the...
Run times at a local marathon are known to follow a left-skewed distribution with a mean...
Run times at a local marathon are known to follow a left-skewed distribution with a mean of 252 minutes and a standard deviation of 116 minutes. If we select a random sample of 59 people, what is the probability that the average run time of this sample will be between 247.469 minutes and 259.551 minutes? Select one: a. 0.3094 b. 0.6915 c. 0.3821 d. 0.0415 e. We cannot answer the question with the information given.
A company has a customer services call centre. The company believes that the time taken to complete a call to the call centre may be modelled by a normal distribution with mean 16 minutes and standard deviation σ minutes. Given that 10% of the calls take
A company has a customer services call centre. The company believes that the time taken to complete a call to the call centre may be modelled by a normal distribution with mean 16 minutes and standard deviation σ minutes. Given that 10% of the calls take longer than 22 minutes, (a) show that, to 3 significant figures, the value of σ is 4.68.(3) (b) Calculate the percentage of calls that take less than 13 minutes.(1) A supervisor in the call centre claims that the mean...
A review of the service call records of Paul’s Plumbing indicates that the time taken for...
A review of the service call records of Paul’s Plumbing indicates that the time taken for a service call can be represented by a normal distribution with mean 75 minutes and standard deviation 20 minutes. a. What is the probability that a service call takes more than 60 minutes? (Be sure to indicate the relevant Z-score for the problem). b. What is the probability that a service call takes less than 80 minutes? (Be sure to indicate the relevant Z-score...
Service calls arriving at an electric company follow a Poisson distribution with an average arrival rate...
Service calls arriving at an electric company follow a Poisson distribution with an average arrival rate of 59 per hour. Using the normal approximation to the Poisson, find the probability that the electric company receives at most 49 service calls per hour. Round your answer to four decimal places, if necessary.
Question 5. A lahmacun company has found that service times for orders follow a normal distribution with a mean of 40 minutes and a standard deviation of 10 minutes. A random sample of five orders was taken. a) The probability is 0.2 that the sample mean of service times is less than how many minutes? (10 pts) b) What is the probability that more than one of these orders take more than 60 minutes? (10 pts)
The distribution of times that a company's service technicians take to respond to trouble calls is normal with mean μ and standard deviation 0.25 hours. The company advertises that its service technicians take an average of 2 hours to respond to trouble calls from customers. We suspect that the average time is really more than 2 hours. From a random sample of 25 trouble calls, the average time service technicians took to respond was 2.10 hours. How strong is the...
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