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Problem 3 ( 2 points): In city Y, the probability that each household uses energy-saving light bulbs
is 0.7 . Select randomly 25 houscholds, what is the probability that there are at least 3 household
uses energy-savino liaht huilh 2 Problem 4 (1.5 points): A box has 5 cards numbered 1 to 5 . Take
randomly 3 cards from the box. Find the probability that we got a three digit number divisible by 3
? (For example 123)

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Problem 3 2 points In city Y the probability that each .pdf

  • 1. Problem 3 ( 2 points): In city Y, the probability that each household uses energy-saving light bulbs is 0.7 . Select randomly 25 houscholds, what is the probability that there are at least 3 household uses energy-savino liaht huilh 2 Problem 4 (1.5 points): A box has 5 cards numbered 1 to 5 . Take randomly 3 cards from the box. Find the probability that we got a three digit number divisible by 3 ? (For example 123)