The graph shows a distribution of data with a standard deviation of 6.
Which statement is true about the data point 84?
It is within 1 standard deviation of the mean.
It is within 2 standard deviations of the mean.
It is exactly 3 standard deviations from the mean.
It is exactly 4 standard deviations from the mean.
60 63 66 69 72 75 78 81 84 87 90 x