An electrical firm manufactures light bulbs that have a length life with normal distribution, and mean equal to 800 hours, and a variance of 9. Find the probability that a random sample of 21 light bulbs will have a sample variance S² between 6.56 and 11.27.

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Q: a) In a binomial distribution containing of 10 independent trials, probability of 1 and 2 successes…

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Q: Express the confidence interval 0.111 < p < 0.999 in the form of p± E. (The confidence interval is…

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Q: For a confidence level of 85%, find the critical z value. Critical z =

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