Situation: Find the substance's half-life, in days.
Round your answer to the nearest tenth.
A 40 gram sample of a substance that's
used for drug research has a k-value of
0.1472.
Enter the correct answer.
N - Noe
-kt
DONE
No - initial mass (at time t = 0)
112
N = mass at time t
k= a positive constant that depends on
the substance itself and on the units
used to measure time
t = time, in days

(co 3) the times that customers spend in a book store are normally distributed with a mean of 39.5 minutes and a standard deviation of 9.4 minutes. a random sample of 25 customers has a mean of 36.1 minutes or less. would this outcome be considered unusual, so that the store should reconsider its displays? no, the probability of this outcome at 0.035, would be considered usual, so there is no problem yes, the probability of this outcome at 0.035, would be considered unusual, so the display should be redone no the probability of this outcome at 0.359 would be considered usual, so there is no problem yes, the probability of this outcome at 0.965 would be considered unusual, so the display should be redone