A study performed by the Pew Research Center reported that 58% of customers used their phones inside a store for guidance on purchasing decisions. A random sample of 35 customers is surveyed. a) Find the probability that exactly 21 have used their phones inside a store for guidance on purchasing decisions. b) Find the probability that more than 25 have used their phones inside a store for guidance on purchasing decisions. c) Find the mean number of customers out of 35 who have used their phones inside a store for guidance on purchasing decisions. Do not round. d) Find the standard deviation number of customers out of 35 who have used their phones inside a store for guidance on purchasing decisions. Round to one decimal place.

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