244 - 165 = 79 . . . . one standard deviation
323 - 244 = 79 . . . . one standard deviation
The range of scores is ±1 standard deviation from the mean. The empirical rule says
68% of scores lie in that range.
3 sets or it you could divide which would still give you 3
SOLVE FOR X (FIRST BOX) SOLVE FOR Y (SECOND BOX)
Answer:
45 copies per minute
Look at drawing for an explanation
