Answer:
The score is 
Step-by-step explanation:
From the question we are told that
The population mean is 
The standard deviation is 
From the question we are told that the score follow a normal distribution
i.e 
The proportion of score in the top 10% is mathematically

Where x is the minimum score required to be in the top 10%
Now the 
So

So

So the critical value of 0.10 from the normal distribution table is 
So


Answer:
18%
Step-by-step explanation:
45 * .18 = 8.10 tip
A.6
<span>because a coefficient is the numerical constant quantity placed before and multiplying the variable in an algebraic expression. (eg 5x so the coeff is 5)</span><span />