So lets do it like this: z = (X-Mean)/SD <span>z1 = (8-12)/2 = - 2 </span> <span>z2 = (16-12)/2 = + 2 </span> <span>According to the Empirical Rule 68-95-99.7 </span> <span>Mean more or less 2SD covers 95% of the values </span> So t<span>he percentage of data points falling between 8 and 16 = 95% </span>I hope this can help
It will cost 83.88 because there are 12 months in a year, and since it's $6.99 every month we will have to multiply $6.99 by 12 which would give us $83.88
