Answer:
<em>A guideline is a statement by which to determine a course of action. A guideline aims to streamline particular processes according to a set routine or sound practice. </em>
Answer:
a) 0.4164
Step-by-step explanation:
Mean lifespan (μ) = 18.8 days
Standard deviation (σ) = 2 days
For any given lifespan 'X', the z-score is:

For X=12.04 days:

A z-score of -3.38 falls in the 0.036-th percentile of a normal distribution.
For X=18.38 days:

A z-score of -3.38 falls in the 41.68th percentile of a normal distribution.
The probability that a butterfly lives between 12.04 and 18.38 days is

16 positive and 26 negative.......16 - 26 = -10 <==
1/19 because the rings would be 1,3,4,5,6 respectively and then u add it up