Monthly stock prices for two competing firms are as follows.

a. Calculate the sample mean, the sample variance, and the sample standard deviation for each firm€™s stock price.
b. Which firm had the higher stock price over the time period?
c. Which firm€™s stock price had greater variability as measured by the standard deviation? Which firm€™s stock price had the greater relativedispersion?

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Month January February March April May June Firm A $28 31 32 35 34 28 Firm B $21 24 24 27 25 20 2