Juan makes a measurement in a chemistry laboratory and records the result in his lab report. the standard deviation of students' lab measurements is =11.20σ=11.20 milligrams. juan repeats the measurement 44 times and records the mean ¯x¯ of his 44 measurements. (a) what is the standard deviation of juan's mean result? that is, if juan kept on making 44 measurements and averaging them, what would be the standard deviation of all his ¯ 'sx¯ 's ? (round your answer to one decimal place.) standard deviation: mg (b) how many times, , must juan repeat the measurement so that the standard deviation of ¯x¯ is 1.081.08 ? (round your answer to the nearest whole number.) =n=