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The Instagram app had an update last night and it was discovered that it is not...

The Instagram app had an update last night and it was discovered that it is not compatible with 9% of people’s phones. a) If 20 people update their phones, what’s the probability that exactly 2 phones are not compatible with the update? b) If 20 people update their phones what’s the probability at least 3 phones are not compatible? c) For 20 people what’s the expected number of phones that won’t be compatible with the update?

Math   Statistics-And-Probability   
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