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A light bulb manufacturer advertises that the average life for their light bulbs is 800 hours. A random sample of 15 of their light bulbs resulted in the following data, in hours;
990 841 953 612 727 800 686 594835 897 943 791 750 667 723
Assume that the bulb life is normally distributed. At the 10% significance level, do the data provide evidence that the mean life for the company's light bulbs differs from the advertised mean?
You draw two cards from a standard deck of 52 cards, but before you draw the second card, you put the first one back and reshuffle the deck.
What is the probability that the kickoff will go between 60 and 75 yards if the average kickoff is 50 yards with a variance of 49?
What is the probability that at least one of the 40 shuttle missions scheduled over the next 5 years results in a critical-item failure?
Find the probability that the number of who consider themselves basketball fans is :
Of the 38 numbers on a roulette wheel, 18 are red, 18 are black and 2 are green. If the wheel is balanced, the probability of the wheel landing on red is 0.474.
In this problem we want to run a test of goodness of fit to check whether the coats in the consignment follow the indicated probabilities.
The Average GPA is known to be 2.67 with standard deviation = 0.58. What GPA will a student need to have to be admitted to the Tech school?
Find out the best predicted household size given that the household discards 5.00 lb of plastic.
Contains two black, six brown, and two blue socks, all randomly arranged. What is the probability that the two he draws are a matching pair?
What is the effect on a confidence interval if one decreases both sample size and the level of confidence?
In standardized form, the normal distribution a) Has a mean of 0 and a standard deviation of 1 b) Has a mean of 1 and a variance of 0 c) Has an area equal to 0.5 d) Cannot be used to approximate discrete probability distributions
Duracell Ltd claim that the life of their batteries in motorised soft toys is approximately normally distributed with a mean of 102.9 hours and a standard deviation of 16.5 hours.
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