A study conducted by a research group in a recent year reported that 75% of cell phone owners used their phones inside a store for guidance on purchasing decisions. A sample of 6 cell phone owners is studied. Round the answers to at least four decimal places. a. Find Probability that exactly 4 cell phone owners used their phones inside a store for guidance on purchasing decisions. b. Find Probability that at most 4 cell phone owners used their phones inside a store for guidance on purchasing decisions. c. Find mean for random variable X. d. Find standard deviation for random variable X.

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