1) Consider a value to be significantly low if its z-score is less than or equal to -2 or consider a value to be significantly hight if its z-score is greater than or equal to 2.

A test is used to access readiness for college. In a recent year, the mean test score was 20.7 and the standard deviation was 4.5. Identify the test scores that are significantly low or significantly high.

Test scores that are less than are significantly low.

Test scores that are greater than are significantly high.

2)Use the following cell phone airport data speeds (Mbps) from a particular network .

0.1 0.4 0.4 0.4 0.5 0.6 0.6 0.6 0.7 0.7

0.8 0.8 0.8 0.8 0.8 0.9 1.1 1.1 1.5 1.7

1.7 2.1 2.4 2.4 2.4 2.5 2.9 3.6 3.7 3.8

3.8 4.4 5.5 6.5 6.6 8.4 8.6 8.7 8.9 11.4

11.5 12.6 13.9 14.6 14.7 15.1 15.1 15.6 15.7 29.7

a) Find : P₉₀ (or 90th percentile).

P90= Mbps

b) Find P_{33}P 33(or 33rd percentile)

P₃₃ Mbps

c) Find the percentile for the data speed of 6.5 Mbps

6.5 Mbps is the th percentile.