標題:
數學難題..數學高手請幫忙
發問:
In a recent survey, a local TV channel finds that the distribution of the durations that public viewers stay tuned to it follows a normal distribution with mean = 80 minutes and standard deviation = 14 minutes. What is the probability that a randomly selected public viewer will stay tuned to that TV channel for a... 顯示更多 In a recent survey, a local TV channel finds that the distribution of the durations that public viewers stay tuned to it follows a normal distribution with mean = 80 minutes and standard deviation = 14 minutes. What is the probability that a randomly selected public viewer will stay tuned to that TV channel for a duration : a) of 75 minutes or less? b) between 55 minutes and 70 minutes? show曬所有working..thz
最佳解答:
(a)Z=(X-μ)/σ Z=(75-80)/14=-0.36 P(Z=-0.36)=0.1046 P(X
其他解答:
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