According to the Center for Disease Control and Prevention (CDC), the mean life expectancy in 2015 for nonHispanic black females was 78.1 years. Assume that the standard deviation was 15 years, as suggested by the Bureau of Economic Research. The distribution of age at death, , is not normal because it is skewed to the left. Nevertheless, the distribution of the mean, , in all possible samples of size is approximately normal if is large enough, by the central limit theorem. Let be the mean life expectancy in a sample of 100 nonHispanic black females. Determine the interval centered at the population mean such that 95% of sample means will fall in the interval. Give your answers precise to one decimal. You may need to use software or a table of - critical values. lower limit years upper limit years Murphy, Sherry L, et. al. Deaths: Final Data for 2015, National Vital Statistics Reports, Volume 66, Number 6, November 27, 2017. https://www.cdc.gov/nchs/data/nvsr/nvsr66/nvsr66_06.pdf. Accessed 24 April 2018. Ryan D. Edwards, The Cost of Uncertain Life Span, NBER Working Paper No. 14093 December, 2011. http://www.nber.org/papers/w14093. Accessed 24 April 2018