Question: 13. A die is rolled 720 times. Using a normal distribution to approximate probabilities, estimate the probability that (a) More than 130 sixes turn up.

13. A die is rolled 720 times. Using a normal distribution to approximate probabilities, estimate the probability that

(a) More than 130 sixes turn up.

(b) The number of sixes obtained lie between 100 and 140 inclusive.

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