Question 633818
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Hi,
standard deviation is 3.33 seconds. 
A) {{{1 = 1.645((3.33)/sqrt(n))}}}
    {{{ n = (1.645*3.33)^2}}}
B) {{{.5 = 1.645(3.33)/sqrt(n)}}}
    {{{ n = ((1.645*3.33)/.5)^2}}}
 solve for n, rounding up