Question 29 In A Small Town The Mean And Standard Deviation Of The Internet Bill Per Month Per Household Are 30 And 55 1 (11.7 KiB) Viewed 30 times
Question 29 In a small town, the mean and standard deviation of the internet bill per month per household are $30 and 55, respectively. The town has in total 400 households. Using the central limit theorem, what is the probability that the total internet bill of the entire town is no more than $12100 in a month? Not yet answered O 0.1587 Marked out of 3.00 O 0.3174 Flag question O 0.3413 O None of the other answers O 0.8413
Question 31 Not yet answered Our department seminar room is lit by 7 light bulbs, controlled by a single switch. A minimum of 3 lights are needed for the room to be usable. Suppose the lifetime of the brand of light bulbs fitted is exponentially distributed with a mean - 400 hours. Assume a seminar lasts exactly 1 hour, and that the lights are switched on only during the seminar. What is the probability that after 500 seminars, exactly 3 bulbs do not need to be replaced? You may need to use a calculator. Give your answer rounded to 4 decimal places. Marked out of 5.00 Flag question Answer:
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