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**Unformatted text preview: **hours is 0. c. Could you estimate the probabilities from parts a and b if the lifespans of light bulbs had a skewed distribution? Explain. If the lifespans of light bulbs had a skewed distribution then we should not estimate the probabilities in parts a or b using the normal distribution. In part a, we would need to use the skewed distribution to do the probability calculations. In part b, because n = 15<30, it already out of normally distributed of 30. 2. The Pew Research Center estimates that as of January 2014, 89% of 18-29 year olds in the United States use social networking sites. Calculate the probability that at least 91% of 500 randomly sampled 18-29 year olds use social networking sites. MTH 243 – PCC (Trude) Name:___________Jin Situ______ _______...

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- Spring '14