Jump to... Suppose that the mass (in grams) of potato chips dispensed into a 20g packet has a normal distribution with a mean of 20.5 and a variance of 4. If forty (40) packets of chips are randomly chosen, what is the probability that the mean weight is more than 20g? Select one: 0.02 0.94 0.32 0.54 0.06

Last year, a person wrote 131 checks. Let the random variable x represent the number of checks he wrote in one day, and assume that it has a Poisson distribution. What is the mean number of checks written per day? What is the standard deviation? What is the variance? ..... The mean number of checks written per day is (Round to three decimal places as needed.) The standard deviation is (Round to three decimal places as needed.) The variance is (Round to three decimal places as needed.)

Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 6.3 parts/million (ppm). A researcher believes that the current ozone level is at an excess level. The mean of 870 samples is 6.4 ppm. Assume the variance is known to be 1.00. Does the data support the claim at the 0.1 level? Step 2 of 5 :   Enter the value of the z test statistic. Round your answer to two decimal places.

Suppose that males between the ages of 40 and 49 eat on average 103.8 g of fat every day with a standard deviation of 4.02 g. The amount of fat a person eats is not normally distributed but it is relatively mound shaped. State the random variable. The amount of fat a male between the ages of 40 and 49 eats every day. The mean amount of fat males between the ages of 40 and 49 eats every day. The standard deviation of the amount of fat males between the ages of 40 and 49 eats every day. Find the probability that a sample mean amount of daily fat intake for 32 men age 40-59 is more than 100 g. Round to four decimal places. P(x > 100) = Find the probability that a sample mean amount of daily fat intake for 32 men age 40-59 in the U.S. is less than 94 g. Round to four decimal places. P(x < 94)= If you found a sample mean amount of daily fat intake for 32 men age 40-59 in the U.S. less than 94 g, what would you conclude? O If the sample mean for 32 men age 40-59 were less than 94 g, there is…