The number of sales calls that 10 telemarketers make in one day are listed below

Question

The number of sales calls that 10 telemarketers make in one day are listed below. 210 330 427 283 345 330 255 433 427 330 What is the median number of sales calls made he number of sales calls that 10 telemarketers make in one day are listed below. 210 330 427 283 345 330 255 433 427 330 What is the variance of the number of sales calls made?

In a recent survey, the following data was obtained in response to the question “Do you access the internet at work?” The responses are listed in the table.

Gender            Yes               No                Total
Females           35                25                60
Males             13                27                40
Total             48                52                100

Given that the person does use the internet at work, what is the probability that the randomly selected person is a female?

Explanation / Answer

mean=sum/n=3370/10=337

variance=(sum(x-mean)2)/n =51396/10=5139.6

standard deviation=sqrt(variance)=sqrt(5139.6)=71.69

median divide the population in two equal part, it is the the middle observation when data is arranged in ascending or descending order. here ther are 10 observation so 5th (330) and 6th(330) observation are in middle. so average of these (330+330)/2=330 is median

(second part) answer is 0.7292

P(person use internet at work)=48/100=0.48

P(female)=60/100=0.6

P(female and use internate at work)=35/100=0.35

P(femal |  person does use the internet at work)=P(female and use internate at work)/P(person use internet at work)=0.35/0.48=0.7292

s.n. x x-mean (x-mean)2 1 210 -127 16129 2 255 -82 6724 3 283 -54 2916 4 330 -7 49 5 330 -7 49 6 330 -7 49 7 345 8 64 8 427 90 8100 9 427 90 8100 10 433 96 9216 n= 10 10 10 sum= 3370 0 51396

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