Answer:
It's not clear on what it means but the information given it would just be 20*3=60
Step-by-step explanation:
Using the normal distribution, it is found that:
a) The pilot is at the 72th percentile.
b) 19.13% of pilots are unable to fly.
<h3>Normal Probability Distribution</h3>
The z-score of a measure X of a normally distributed variable with mean
and standard deviation
is given by:

- The z-score measures how many standard deviations the measure is above or below the mean.
- Looking at the z-score table, the p-value associated with this z-score is found, which is the percentile of X.
The mean and the standard deviation are given, respectively, by:
.
Item a:
The percentile is the <u>p-value of Z when X = 74.2</u>, hence:


Z = 0.59
Z = 0.59 has a p-value of 0.7224.
72th percentile.
Item b:
The proportion that is able to fly is the <u>p-value of Z when X = 78 subtracted by the p-value of Z when X = 70</u>, hence:
X = 78:


Z = 2
Z = 2 has a p-value of 0.9772.
X = 70:


Z = -0.96
Z = -0.96 has a p-value of 0.1685.
0.9772 - 0.1685 = 0.8087 = 80.87%.
Hence the percentage that is unable to fly is:
100 - 80.87 = 19.13%.
More can be learned about the normal distribution at brainly.com/question/4079902
#SPJ1
4x1= 4 easy ......correct
For the answer to the question above,
and we are told that there are "four times as many quarters as nickels"
this translates to
q = 4n
0.05n + 0.25q = 2.10
and
q = 4n
are your two equations that could be used to solve this problem
if you would like to know how many nickels and how many quarters there are, plug in q = 4n into the first equation and get
0.05n + 0.25(4n) = 2.10
then I would stop here
because I didn't see the choices. So the answer is 4n
Answer:
Jon rode <u>17 miles</u> and Kelly rode <u>31 miles</u>.
Step-by-step explanation:
Given:
Kelly rode her bike 3 miles less than twice the number of miles Jon rode.
Together they rode 48 miles.
Now, to find the miles they each ride.
<em>Let the number of miles Jon rode be </em>
<em />
<em>So, the number of miles Kelly rode is</em> 
Together they rode = 48 miles.
Now, to get the miles they each rode:
According to question:



<em>Adding both sides by 3 we get:</em>

<em>Dividing both sides by 3 we get:</em>

<em>Jon rode = 17 miles.</em>
So, to get the miles Kelly rode we substitute the value of
:
<em>And Kelly rode = </em>
<em />



Therefore, Jon rode 17 miles and Kelly rode 31 miles.