Beth’s scores on the six Earth science tests she took this semester are: 100, 95, 55, 85, 75, 100 For this population, how many scores are within one standard deviation of the mean?

Answer 1

mean = arithmetic average = 85

with standard deviation >15, all are within one standard deviation of the mean except 55

standard deviation = square root of (sum of squared deviations from the mean divided by N-1 or 5) = sqr310 > 17