Questions from Statistics Principles

Q: Suppose 15% of the trees in a forest have severe leaf

Suppose 15% of the trees in a forest have severe leaf damage from air pollution. If 5 trees are selected at random, find the probability of: (a) Three of the selected trees h ave severe leaf damage....

Q: Rh-positive blood appears in 85% of the white population

Rh-positive blood appears in 85% of the white population in the United States. If 8 people are sampled at random from that population, find the probability that: (a) At least 6 of them have Rh-positi...

Q: Using the binomial table, find the probability of: (

Using the binomial table, find the probability of: (a) Four successes in 13 trials when p = .3. (b) Eight failures in 13 trials when p = . 7. (c) Eight successes in 13 trials when p = .3. Explain...

Q: According to the U.S. Census Bureau, about 10

According to the U.S. Census Bureau, about 10% of persons between 25 and 29 years old live alone. For a random sample of size n, use the binomial table, or software, to find the probability of (a) l...

Q: About 30% of adults say that reading is a favorite leisure

About 30% of adults say that reading is a favorite leisure activity. Let success be the outcome that reading is a favorite leisure activity. Find the probability that: (a) More than 5 trials are need...

Q: A survey report states that 70% of adult women visit their

A survey report states that 70% of adult women visit their doctors for a physical examination at least once in two years. If 20 adult women are randomly selected, find the probability that: (a) Fewer...

Q: Calculate the mean and standard deviation of the binomial distribution using the

Calculate the mean and standard deviation of the binomial distribution using the formulas in mean = n p (a) If n is changed to 20. (b) When n 20. (c) When n = 40.

Q: Each week a grocery shopper buys either canned (C) or

Each week a grocery shopper buys either canned (C) or bottled (B) soft drinks. The type of soft drink purchased in 3 consecutive weeks is to be recorded. (a) List the sample space. (b) If a different...

Q: (a) For the binomial distribution with n = 3 and

(a) For the binomial distribution with n = 3 and p = .6, list the probability distribution ( x, f ( x)) in a table. (b) From this table, calculate the mean and standard deviation by using the methods...

Q: Suppose that 20% of the college seniors support an increase in

Suppose that 20% of the college seniors support an increase in federal funding for care of the elderly. If 20 college seniors are randomly selected, what is the probability that at most 3 of them supp...