The mean game scores and standard deviations of four seasons of a football team are given below. season mean standard deviation 2005 19 3.5 2006 21 2.8 2007 12 1.0 2008 9 4.0 which statement must be true?

To find the margin of error, multiply the z-score by the standard deviation, then divide by the square root of the sample size.The z*-score for a 90% confidence level is 1.645.The margin of error is 0.20.The confidence interval is 48.3 to 48.7.48.8 is not within the confidence interval. 

I’m pretty sure it’s i think : /