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Psychology and Human Behavior In Columbia, South Carolina, on a randomly selected Friday night between 9:00 p.m. and 2:00 a.m., the time (in minutes) between calls to a 911 dispatcher has an exponential distribution with l 5 0.125. Suppose a Friday evening in Columbia is selected at random.a. If a 911 call is taken at 10:07 p.m., what is the probability that the next call will occur before 10:30 p.m.?b. If a 911 call is taken at 11:30 p.m., what is the probability that the next call will occur after 11:45 p.m.?c. Find the mean, variance, and standard deviation for the time between 911 calls.d. Find a value t such that if a 911 call is received between 9:00 p.m. and 2:00 a.m., then the probability that the next 911 call will occur more than t minutes later is 0.75
The distribution under the normal curve can be seen a lot in society, although you may not even notice it. Have you been watching the presidential candidate.
What is the probability a white car could be pink if there are two cans of purple, paint two cans of blue and 1 can of white?
a retail store in des moines iowa receives shipments of a particular product from kansas city and minneapolis. letx
the cardboard bales produced at a local recycling depot have an average weight of 400kg with a standard deviation of
you are picking a bouquet of 20 flowers for your mother at random from a garden with 25 coneflowers 35 daisies and 42
The average salary of a group of sales people is $32,500 with a standard deviation of $2,500. Answer the following: How much would a salesperson make if he/she is 2 standard deviations above the mean?
Statistics journals. When a professional statistician has information to share with colleagues, he or she will submit an article to one of several Statistics.
Top-grade offering a new shipping option. When an order is placed, top-grade will ship one third of the order every week for three weeks instead of at one time. What is the order quantity if Omar chooses to use this option? To simplify your calcul..
1. A sample of 65 observations is selected from one population. The sample mean is 2.67 and the sample standard deviation is .75. A sample of 50 observations is selected from a second population
Consider a balanced four by three factorial. Show that orthogonal contrasts in row means (ignoring factor B) are also orthogonal contrasts for all twelve treatments when the contrast coefficients have been repeated across rows (ij = i).
Federated South Insurance Company has developed a new screening program for selecting new sales agents. Given the expected improvement, what is the probability that 19 or more reach their minimum sales goals
Set up hypotheses to test if distribution of birthdays can be considered coming from uniform distribution.
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