number 5 5. A sample was taken of the salaries of four employees from a large co

Question

number 5

5. A sample was taken of the salaries of four employees from a large company. The following are their salaries (in thousands of dollars) for this year. 33, 31, 24, 36. The sample standar deviation (s) of their salaries (in thousands of dollars) is (3pts) a. 5.1 b. 26 c. 31 d. 5.6 (7pts) A commuter must pass through five traffic lights on her way to work, and she will have to stop at each one that is red. Let X= the number of red lights she stops at on her way to work. She estimates the distribution for X to be as shown below: 10 0 302132 Nalue ofr 01 030 0,2 0.15 0.05

Explanation / Answer

Mean =( 33+31+24+36 )/ 4 = 31

Sample standard deviation = Sqrt[[ ( 33-31)^2 + (31-31)^2+(24-31)^2 +( 36-31)^2 ] / (4-1) ] = sqrt( 78/3) = 5.10

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