8:04 Done docs.google.com AA If the joint distribution of X and Y is given by 0SXs1. f(x,y) = 9x?y? 8 0 O sys2 otherwise Then P(x2Y = 2) = None of these 26/27 37/64 19/27 The standard deviation of a cigarette's nicotine content is 0.3 mg. How large sample must be selected if we want to be 95% confident of getting an interval that contains the true mean with a maximum error of 0.04mg At least 385 At least 216 At least 217 At least 139