A company is in the business of finding addresses of long-lost friends. The comp

Question

A company is in the business of finding addresses of long-lost friends. The company claims to have a 70% success rate. Suppose that you have the names of five friends for whom you have no addresses and decide to use the company to track them. (a) Make a histogram showing the probability of r = 0 to 5 friends for whom an address will be found. (b) Find the mean and standard deviation of this probability distribution. What is the expected number of friends for whom addresses will be found7 (Round your answers to two decimal places.)mu = friends sigma = friends (c) How many names would you have to submit to be 97% sure that at least two addresses will be found? (Enter your answer as a whole number.) names Tree-ring dates were used extensively in archaeological studies at Burnt Mesa Pueblo. At one site on the mesa, tree-ring dates (for many samples) gave a mean date of = mu_1 = year 1254 with standard deviation sigma_1 = 38 years. At a second, removed site, the tree-ring dates gave a mean of mu_2 = year 1111 with standard deviation sigma_2 = 35 years, Assume that both sites had dates that were approximately normally distributed. In the first area, an object was found and dated as X_1 = year 1225, In the second area,

Explanation / Answer

a) from binomial distribution n=5, p=0.7

top left graph is right

b)mean =np=5*0.7=3.5

std deviation =(np(1-p))1/2 =1.02

c) let n is the sample size

P(X>=2)>0.97

1-P(X<=1)>0.97

P(X<=1)<0.03

prom permutation and combination

n=6

r P(x) 0 0.00243 1 0.02835 2 0.1323 3 0.3087 4 0.36015 5 0.16807

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