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Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

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?

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?