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It is your birthday and you are waiting for someone to write you a birthday message on Facebook. On average (on your birthday) you receive a facebook message every 10 minutes. Assume that the times between the birthday messages are independent.
a) What is the probability the next posting takes 15 minutes or longer to appear?
b) What is the standard deviation of the time between birthday postings?
c) What is the probability that it takes 12.5 minutes for the next birthday posting?
d) Suppose that the most recent birthday posting was done at 1:40 pm and it is now 1:45 pm. What is the probability that you will have to wait until 1:53 pm or later for the next message?
e) What is your median waiting time for birthday messages?
FBI Report do greater universities that tend to have more property crime. Keep a scatter diagram also sketch the line you think best fits the data.
Given the following sample information, test the hypothesis that the treatment means are equal at the .05 significance level.
Carry out the suitable hypothesis test, at alpha = .05, to find out whether there is a relationship between school/work and stress.
Determine the median, and the standard deviation. Determine the coefficient of skewness using Pearson's method. Listed below are the commissions earned ($000) last year by the sales representatives at the Furniture Patch, Inc.
the random variables x and y have expected values 8 and 25 standard deviations 4 and 9 respectively.a calculate the
IQ tests generally have scores in which the mean is 100, and the standard deviation is 16. If your IQ score was 134, what percentage of the population would have a higher IQ than you?
Perform a significance test to see if there is a relation between mortality and duration of employment in the group hired AFTER 1945 and report a p-value.
Is there a significant difference in sales dollars of hats between the west side and east side stores at the 5 percent level of significance? (a) State the hypotheses. (b) State the decision rule and sketch it. (c) Find the test statistic and stat..
A pediatrician is interested in studying the effect of Motrin on reducing temperature in young children. Four children with influenza have their temperatures taken immediately before and then 20 minutes after taking a standard dose
The U.S. Department of Transportation defines an airline flight as being "on-time" if it landed less than 15 minutes after the scheduled time shown in the carrier's Computerized Reservation System.
the standard deviation is defined to be the square root of the variance.1 explain why it is conventional to take the
question weight of navel orangessuppose that the weight of navel oranges is normally distributed with mean micro 8
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