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How will you fulfill customer expectations?

Which branch of statistics is involved when a state senator surveys some of her constituents in order to obtain guidance on how she should vote on a piece of legislation?

Suppose we want to choose a sample of about 10 students out of class of 80 students by using a systematic sampling technique. If the starting number student interred in the sample is 6th student then find the other 9 students. 



The mean set of 10 observations is 4. Another set of 20 observations is added on it which makes the mean of the combined set equal to 6, then find the mean of the second set. 


1. With experience, a secretary makes 3 errors per page on average. Find the probability that

A. She makes no error

B. At least she makes 2 errors per page

C. At most she makes 2 errors per page



A random variable X (late X is the weight of persons in Ethiopia) has a normal distribution which mean 72.4 with a variance 169. What is the probability that it will take a value greater than 82.9?

Discuss why you think that Generation Y is the most important segment of their market.


Should Gap categorise everyone I this market as ‘the youth’. Why or why not?

Some characteristics of annually family income distribution (in Birr) in two regions is as follows

 

Region Mean Median Standard deviation

A 6250 5100 960

B 6980 5500 940

A.  Calculate coefficient of skewness for each region

B. For which region the income is more consistent

An analysis of the monthly wages paid (in birr) to workers in two firms A and B belonging to the same industry gives the following results.

 

Value Firm A Firm B

Mean wage 52.5 47.5

variance 100 121

In which firm A or B is there greater variability in individual wages?



Calculate the mean deviation about the mean, median and mode, and their coefficients and also variance and standard deviation for the following data


Size of shoes      3 6 11 2 4 10 5 7 8 9

No, of pairs sold 10 15 25 6 4 3 2 8 9 4


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