I think the answer is b -3.
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Answer:
17.9
Step-by-step explanation:
It would first be 0.7 and then 1.1
Let x be a random variable representing the length of a text messaging conversation, then
P(x > 3) = 1 - P(x < 3) = 1 - P(z < (3 - 2)/0.5) = 1 - P(z < 2) = 1 - 0.97725 = 0.02275