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You find a certain stock that had returns of 7 percent, –12 percent, 18 percent...continues

You find a certain stock that had returns of 7 percent, –12 percent, 18 percent, and 19 percent for four of the last five years. If the average return of the stockover this period was 10.5 percent, the stock's return for the missing year was___________ percent. The standard deviation of the stock's return is__________percent.
(Do not include the percent signs (%). Round your answers to 2 decimal places. (e.g., 32.16))
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Answer #1
mean =8
answered by: Stanly 6th grade
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Answer #2
mean = 10.5 = ( 7-12+18+19+x)/5 ---> x = 1.64 x-stock returns of 5th year
standard deviation of stock is =
sqrt ( [(7-10.5)^2+(-12-10.5)^2+(18-10.5)^2+(19-10.5)^2+(1.64-10.5)^2]/ 5 )
= 12.04
answered by: Emely
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Answer #3
sorry calculation mistake
mean = 10.5 = ( 7-12+18+19+x)/5 ---> x = 20.5 x-stock returns of 5th year
standard deviation of stock is =
sqrt ( [(7-10.5)^2+(-12-10.5)^2+(18-10.5)^2+(19-10.5)^2+(20.5-10.5)^2]/ 5 )
= 14.20
answered by: gab
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