Scores on a certain test are normally distributed with a variance of 88. a researcher wishes to estimate the mean score achieved
by all adults on the test. find the sample size needed to assure with 95 percent confidence that the sample mean will not differ from the population mean by more than 3 units.
Justine > Ava > Emma 12 - 7.5 = 4.5 x + (x+4.5) +(x+12) = 3x + 16.5 = 63 63-16.3 = 56.7 56.7/ 3 = 18.9 A: Emma has $ 18.9 Ava has $23.4 Justin has $30.9