Suppose that the rate of return on stocks is normally distributed with a mean of 9% and a standard deviation of 3%. If I pick five stocks at random, what is the probability that at least two of them will have a return of more than 12%.
Suppose that the rate of return on stocks is normally distributed with a mean of 9%...
4. A manufacturer knows that their items have a normally distributed lifespan, with a mean of 14.4 years, and standard deviation of 3.2 years. If you randomly purchase 21 items, what is the probability that their mean life will be longer than 15 years? (Give answer to 4 decimal places.) 5. A particular fruit's weights are normally distributed, with a mean of 704 grams and a standard deviation of 12 grams. If you pick 12 fruit at random, what is...
5. A particular fruit's weights are normally distributed, with a mean of 704 grams and a standard deviation of 12 grams. If you pick 12 fruit at random, what is the probability that their mean weight will be between 692 grams and 701 grams (Give answer to 4 decimal places.) 6. A particular fruit's weights are normally distributed, with a mean of 286 grams and a standard deviation of 18 grams. If you pick 25 fruit at random, what is...
Yearly Returns for stocks is normally distributed around a mean of 9% with a standard deviation of 12%. A random sample of 2000 stock returns is shown on the Stock Returns worksheet. (6) (To three decimal places) what is the probability of a stock having a negative yearly return? (7)(Tothree decimal places) what is the probability of a stock having a yearly return between 5% and 8%? (8) (To three decimal places) What is the relative frequency of stocks, from the...
7. Suppose that the width of pebbles in a river is normally distributed with mean of 12.1 mm and standard deviation of 3.2 mm. a. What is the probability that X is smaller than 11? b. A random sample of 12 pebbles is taken. What is the probability that X-bar < 11?
Suppose that SAT test produces scores that are normally distributed with mean = 500 and standard deviation = 100. what is the probability that at least two of the five randomly selected individuals will have SAT scores in the range [490, 535]? Show all steps. Thanks
1) a) A manufacturer knows that their items have a normally distributed length, with a mean of 13.4 inches, and standard deviation of 2 inches. If one item is chosen at random, what is the probability that it is less than 7.5 inches long? b) A manufacturer knows that their items lifespans are normally distributed with mean = 14.2 and standard deviation = 3.9. What proportion of the items' lifespans will be longer than 25 years? c) A particular fruit's...
Suppose the scores of students on an exam are Normally distributed with a mean of 303 and a standard deviation of 39. Then approximately 99.7% of the exam scores lie between the numbers and such that the mean is halfway between these two integers. (You are not to use Rcmdr for this question.) answer: answer: the weights of cans of Ocean brand tuna are supposed to have a net weight of 6 ounces. The manufacturer tells you that the net weight...
Question 11 A manufacturer knows that their items have a normally distributed length, with a mean of 15.6 inches, and standard deviation of 4.7 inches. If 23 items are chosen at random, what is the probability that their mean length is less than 18.1 inches? Pa < 18.1) = Submit Question Question 12 BO A manufacturer knows that their items have a normally distributed lifespan, with a mean of 9.3 years, and standard deviation of 2.7 years. If you randomly...
4. A lift has an occupancy warning of no more than 25 people and of total weight no more than 1950kg. For a population of users, suppose weights are normally distributed with mean 75kg and standard deviation 10kg (a) What is the probability that the total weight of a random sample of 25 people from the population exceeds 1950kg? (b) Calculate the probability that a random sample of 24 people sets the alarm off. (c) Suppose people carry things with...
A bank auditor claims that credit card balances are normally distributed with mean $3000 and standard deviation $500. Suppose the auditor randomly select two card holders What is the probability both of them have card balances more than 2500?