Market-share-analysis company Net Applications monitors and reports on internet browser usage. According to Net Applicat

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Market-share-analysis company Net Applications monitors and
reports on internet browser usage. According to Net Applications,
in the summer of 2014, Google's Chrome browser exceeded a 20%
market share for the first time, with a 20.37% share of the browser
market.† For a randomly selected group of 15 Internet browser
users, answer the following questions. (Round your answers to four
decimal places.)
(a) Compute the probability that exactly 7 of the 15 Internet
browser users use Chrome as their Internet browser. (Round your
answer to four decimal places.)
(b) Compute the probability that at least 3 of the 15 Internet
browser users use Chrome as their Internet browser. (Round your
answer to four decimal places.)
(c) For the sample of 15 Internet browser users, compute the
expected number of Chrome users.
(d) For the sample of 15 Internet browser users, compute the
variance and standard deviation for the number of Chrome users.
(Round your answers to four decimal places.)
variance=
standard deviation=