The box part of the box plot contains all the values between which numbers?

+

25



30

35

40

45

50

between 27 and 36 and between 37 and 40

between 32 and 36

between 32 and 37

between 27 and 32 and between 37 and 40

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?