X is normally distributed with mean 100 and standard deviation 20. What is the probability that X is greater than 145?
Answer to relevant QuestionsX is normally distributed with mean 250 and standard deviation 40. What value of X does only the top 15% exceed?The lifetimes of light bulbs that are advertised to last for 5,000 hours are normally distributed with a mean of 5,100 hours and a standard deviation of 200 hours. What is the probability that a bulb lasts longer than the ...Refer to Exercise 8.46. Find the probability of these events.a. A 2-year-old child is taller than 36 inches.b. A 2-year-old child is shorter than 34 inches.c. A 2-year-old child is between 30 and 33 inches tall.It is said that sufferers of a cold virus experience symptoms for 7 days. However, the amount of time is actually a normally distributed random variable whose mean is 7.5 days and whose standard deviation is 1.2 days.a. What ...The demand for a daily newspaper at a newsstand at a busy intersection is known to be normally distributed with a mean of 150 and a standard deviation of 25. How many newspapers should the news stand operator order to ensure ...
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