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The probability distribution for number of new android apps launched in a week during the year 2009 are as follows:
Number of Apps Probability (number of Apps=x)
20 0.15
25 ?
30 0.30
35 0.20
a) What is the probability that at most 25 apps were launched? (Hint: You need to find the ?)
b) Find the mean number of apps launched in a week.
c) Find the standard deviation.
The length of a bearing has mean 2 cm and standard deviation 0.001 mm. What are the mean and standard deviation of the total length of the assembly?
While taking a walk along the road where you live, you accidentally drop your glove, but you don't know where. The probability density p(x) for having dropped.
each person in a random sample of 225 male teenagers and a random sample of 306 female teenagers was asked how many
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The data file ex0218 contains the beak depths (in mm) of all 751 finches captured by Peter and Rosemary Grant in 1976 and all 89 finches captured in 1978 (as described in Section 2.1.1). Use a statistical computer program for parts a-d:
Show the sampling distribution of p if a random sample of 150 insured individuals is used to estimate the proportion having received at least one ticket.
How does non-statistical sampling differ from statistical sampling and when might an auditor choose one over the other? Explain each of these statements and discuss why the two comparisons are similar.
A California lawyer practices law, on the average, for 30 years. Assuming these members remain steady, how many lawyers would you expect California to have in 2050.
ECON1005 INTRODUCTORY STATISTICS Assessment: State the null and the alternative hypotheses for this test
The incidences of Disease Z were 0.001% and 0.032% in Country A and Country B, respectively. What is the relative risk (RR) of having such disease in Country B
Given a list of words and the empirical probabilities they occur in spam e-mails and in e-mails that are not spam.
As a way of fund raising, you decide to set up a hot dog stand, after a few weeks of doing this you sell 8 hot dogs every 10 minutes.
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