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.

We can calculate limits required with the condition of 2 deviations from the mean and we got:

If a value is lower than 11.7 we can consider it as too low

If a value is Higher than 29.7 we can consider it as too high

Step-by-step explanation:

For this case we know the following info:

represent the mean

And we want to find scores that are significantly low or significantly high

We can calculate limits required with the condition of 2 deviations from the mean and we got:

If a value is lower than 11.7 we can consider it as too low

If a value is higher than 29.7 we can consider it as too high

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

b

step-by-step explanation: