Question 194043This question is from textbook understanding basic statistics
: Sam is a representative who sells large appliances such as refrigerators, stoves, and so forth.Let x= number of appliances sam sells on a given day.Let F =frequency (number of days) with which he sells X appliances for a random sample of 240 days, Sam had the following sales record.
x|0|1|2|3|4|5|6|7
f|9|72|63|41|28|14|8|5
assume the sales record is representative of the population of all sales day.
d)compute the probability that x is less than 3.
e)compute the expected value of the x distribution.
f)compute the standard deviation of the x distribution.
This question is from textbook understanding basic statistics
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Sam is a representative who sells large appliances such as refrigerators, stoves, and so forth.Let x= number of appliances sam sells on a given day.Let F =frequency (number of days) with which he sells X appliances for a random sample of 240 days, Sam had the following sales record.
x|0|1|2|3|4|5|6|7
f|9|72|63|41|28|14|8|5
assume the sales record is representative of the population of all sales day.
d)compute the probability that x is less than 3.
P(x = 0,1,or 2) = (9+72+63)/240 = 0.6
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e)compute the expected value of the x distribution.
E(x) = 0(9/240)+ 1(72/240) + 2(63/240) + etc
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f)compute the standard deviation of the x distribution.
That is a lot of arithmetic. I used a TI calculator
and got s = 2.449...
Cheers,
Stan H.
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