The amount of time that customers wait in line during peak hours at one bank is normally distributed with a mean of 12 minutes and a standard deviation of 2 minutes. What is the probability that a customer will wait under 14 minutes?

The time to resolve a problem at a technical helpdesk in a mobile phone company is normally distributed with a mean of 17 minutes and a standard deviation of 3 minutes. a) For a randomly selected customer, find the probability that his problem can be solved in less than 12 min. b) For a randomly selected customer, find the probability that his problem can be solved between 18 mins and 20 mins. c) 40% of the customers are dissatisfied with the waiting time. What is the minimum waiting time for a dissatisfied customer?

The manager of a computer shop is recording the time taken for customers to decide of which computer and accessories they buy from the time they enter the store. From the previous data, it is known that the average ‘decision’ time was 45 minutes. The manager assumes a normally distributed population with a standard deviation of 10 minutesa)  What is the probability that a customer will take more than 60 minutes?

The manager of a grocery store has taken a random sample of 100 customers to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes. She observes that the average length of time it took the customers in the sample to check out was 3.1 minutes. The population standard deviation is known to be 0.5 minutes.

1:13:55Question 16Not yet answeredMarked out of 9.00Flag questionTipsQUESTION 1The manager of a computer shop is recording the time taken for customers to decide of which computer and accessories they buy from the time they enter the store. From the previous data, it is known that the average ‘decision’ time was 45 minutes. The manager assumes a normally distributed population with a standard deviation of 10 minutesa)  What is the probability that a customer will take more than 60 minutes?b)  What proportion of customers will take between 35 and 60 minutes?c)  From a sample of 36 customers, what is the probability that the sample mean will be less than 40 minutes?

The waiting time to check out of a supermarket has had a population mean of 11.02 minutes.Recently,in an effort to reduce the waiting time,the supermarket has experimented with a system in which there is a single waiting line with multiple checkout servers.A sample of 50 customers was selected,and their mean waiting time to check out was 9.79 minutes with a sample standard deviation of 5.6 minutes.Complete parts(a)through(d). Click here to view page 1 of the critical values for the t distribution. Click here to view page 2 of the critical values for the t Distribution. a.At the 0.01 level of significance,using the critical value approach to hypothesis testing,is there evidence that the population mean waiting time to check out is less than 11.02 minutes? What are the null and alternative hypotheses for this test?