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The standard deviation of the lengths of hospital stay on the intervention ward is 7.2 days. Complete parts (a) through (c) below. a. For the variable "length of hospital stay," determine the sampling distribution of the sample mean for samples of 69 patients. The standard deviation of the sample mean is o = days. imate (Round to four decimal places as needed.) b. The distribution of the length of hospital stay is right skewed. Does this invalidate your result in part (a)? Explain your answer. O A. Yes, because x is only normally distributed if x is normally distributed O B. Yes, because the sample sizes are not sufficiently large that x will be approximately normally distributed, regardless of the distribution of x. O C. No, because the sample sizes are sufficiently large that x will be approximately normally distributed, regardless of the distribution of x. D. No, because if x is normally distributed, then x must be normally distributed