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1. A door to door salesperson believes that the probability of making a sale when a person is at home is 0.4 he visits 10 homes. When someone is at home find the probability of making a) exactly 7 sales b) more than 7 sales
2.For a binomial distribution with an n=200 and p=0.3 calculate the probability of obtaining between 50 and 70 successes inclusive in 200 trials .Use the approximation to the binomial .
3.Find the area under the standard normal curve in each case below:
a) below a zscore of 2.5
b) between the z scores of -2.33 and 0.5
c) above the zscore of -1.3
4. A quality control tech is testing the accuracy of a certain type of resistor. He finds that the distribution of resistance is normal with a mean of 14.06 ohms and a standard deviation of 1.73 ohms
A) what is the probability that one of these resistors picked at random will have a resistance of 16 ohms or more?
B) What is the probability that one of these resistors picked at random will have a resistance between 13.06 ohms and 15.06 ohms, inclusive?
Based on your interval, do you believe you have strong evidence to indicate that the average weekly sales of restaurants in this chain are significantly higher than $22,000? Explain
At a .05 level of significance, is there evidence of a relationship between financial condition and education level?
the life of a recirculating pump follows a weibull distribution with parameters beta 2 and delta 700 hours.a
the us senate committee consists of 8 members. 5 members are democrates and 3 are republicans. a subcommittee of size 4
Find the z-score for each student and indicate which one has a better relative position. An Art Major earned a grade of 46 on an exam with = 50 and s = 5.
at a track and field tournament freds long jumps vary evenly from 6.5 to 7.2 meters. let x be the length of freds long
Why do a null and alternative hypothesis have to be mutually exclusive? When would you accept the null hypothesis? Can you give an example of this?
q1. suppose the monthly percentage changes in the tse 300 index from 1980 to 2000 are normally distributed with a
the number of yearly breakdowns for the power generator observed over the past 20 years at orlando utilities is
to test the effect of a physical fitness course on ones physical ability the number of sit-ups that a person could do
What type of probability distribution is appropriate for this problem? Determine the probability of getting no calls between eight and nine in the morning. Calculate the probability of getting exactly five calls between eight and nine in the morning
A group of students at a school takes a history test. The distribution is normal with a mean of 25, and a standard deviation of 4. (a) Everyone who scores in the top 30% of the distribution gets a certificate.
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