• Suppose the amount of money in student pockets are normally distributed with mean to be $56.40 and standard deviation is $8.40. If you pick a person at random, what is the probability that he/she has either less than $30 or more than $70?
• A lot of 24 bulbs contains 25% defective bulbs. A bulb is drawn at random from the lot. It is found to be not defective and it is NOT put back. Now, one bulb is drawn at random from the rest. What is the probability that this bulb is not defective?
• The Vitamin C content of a particular brand of vitamin supplement pills is normally distributed with mean 490 mg and standard deviation 12 mg. What is the probability that a randomly selected pill contains at least 500 mg of Vitamin C
• The cholesterol content of 1-piece Chickenjoy is normally distributed with a mean of 200 milligrams and standard deviation 15 milligrams. In sixty-seven percent of the eggs, the cholesterol content is less than a certain value X. Find the value of X.
• The weights of 1-year-old boys are approximately normally distributed, with a mean of 22.8 lbs and a standard deviation of about 2.15. What weight does a 1-year-old boy need to be so that 95% of 1-year-old boys weight less than he does?