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Transcript
19) The probability of at least 35 boys
19)
20) The probability of fewer than 49 democrats
20)
21) The probability of exactly 36 green marbles
21)
22) The probability of no more than 64 defective CD's
22)
23) The probability that the number of correct answers is between 18 and 48 inclusive
23)
For the binomial distribution with the given values for n and p, state whether or not it is suitable to use the normal
distribution as an approximation.
24) n = 22 and p = 0.6
24)
25) n = 19 and p = 0.8
25)
26) n = 19 and p = 0.5
26)
27) n = 17 and p = 0.2
27)
28) n = 63 and p = 0.7
28)
29) n = 33 and p = 0.9
29)
Estimate the indicated probability by using the normal distribution as an approximation to the binomial distribution.
30) Estimate the probability of getting exactly 43 boys in 90 births.
30)
31) A product is manufactured in batches of 120 and the overall rate of defects is 5%.
Estimate the probability that a randomly selected batch contains more than 6 defects.
Use the normal distribution to approximate the desired probability.
32) Merta reports that 74% of its trains are on time. A check of 60 randomly selected trains
shows that 38 of them arrived on time. Find the probability that among the 60 trains, 38
or fewer arrive on time. Based on the result, does it seem plausible that the "on-time"
rate of 74% could be correct?
3
31)
32)