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Probability distribution for number of new android apps

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Reference no: EM131818449

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.

Reference no: EM131818449

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