What is the interquartile range of the set of data represented by the following box-and-whisker plot?

2.5

8

10

1.5

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?

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?