Statistics and Probability Answers

The mean value of land and buildings per acre from a sample of farms is ​$18001800​, with a standard deviation of ​$300300. The data set has a​ bell-shaped distribution. Assume the number of farms in the sample is 7171.

Question 6 : Find the probability that seven of 10 persons will recover from a tropical disease if we can assume independence and the probability is 0.80 that any one of them will recover from the disease

Exercise 2. In a city, 65% of people drink coffee, 50% drink tea, and 25%
both. What is the probability that
(1) a person chosen at random will drink at least one of coffee or tea?
(2) a person will drink neither?

A random sample of 100 record shops found that the average weekly sale of a particular record was 260 copies. With standard deviation of 96. Find the 95% confidence interval to estimate the true average sale for all shops.

If a list of 20 individuals who volunteered to supply blood, when it is needed for transfusion, has 15 individuals of type B blood and 3 individuals are selected random from the list, what is the probability that:

a) All 3 will be type B, b) 2 will be of type B and 1 will not, c) at least 1 will be of type B

If the probability is 0.60 that a divorce will remarry within 3 years, find the probability that of 5 divorces :
a) 3 out of 5 divorces will remarry within 3 years
b) At least 3 will remarry within 3 years
c) At most 3 will remarry within 3 years

in a hospital 60% of the patients are married. What's the probability that a sample of one word with 8 patient, had 3 married

Given that 51.3% of all newly born children are boys, then what is the probability that in a sample of 5 newly born children, exactly 3 are boys?

Given that 51.3% of all newly born children are boys, then what is the probability that in a sample of 5 newly born children, exactly 3 are boys?

in an examination, 30% of the students have failed in engineering mechanics, 20% of the students have failed in mathematics nd 10% have failed in both the subjects. a student is selected at random. 1). what is the probability that the student has failed in engineering mechanis if it is known that he has failed in mthematics? , 2). wht is the probability that the student has failed either in engineering mechanics or in mathematics?