63 [rhe average and standard deviation of the 100 sample means makes sense based on the sample and the histogram. 64 65 2. Rockwell hardness of pins of a certain type is known to have a mean value of 50 and standard deviation of 1.2. 66 67 i) If the distribution is normal, what is the probability that the sample mean hardness for a random sample of 9 pins is at least 517 68 69 ii) Without assuming population normality, what is the (approximate) probability that the sample mean hardness for a random sample of 40 pins is at least 517 70 71 72 - ### Code chunk 73+ " {r} = 74 # start your code 75