To estimate the mean number of days a stock has positive daily increases within a year, business researchers initiated a study. From previous similar studies it is known that the standard deviation of the population is 10.21. With this planning value, what sample size must now be taken for the 95% confidence interval to have the margin of error of 1.17? Use the fact that 95% of normally distributed observations are within 1.96 standard deviations. 

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