The GRE Scores are represented as ~N(310,12)
In order to find the proportion of scores between 286 and 322, we need to standardize the scores so we can use the standard normal probabilities. Thus, we will find the z-score.
By looking on the standard normal probabilities table, we find the proportion of scores less than -2.
P(z < -2) = 0.0228
Then, we find the proportion of scores less than 1.
P(z < 1) = 0.8413
To find the proportion between -2 and 1, we subtract the two.
P(-2 < z < 1) = 0.8413 - 0.0228 = 0.8185 = 81.85%
Therefore, 82% of scores are between 286 and 322
The answer is d which is 904 yards
Answer:
$24.88
Step-by-step explanation:
<u><em>Given:</em></u>
<em>Samantha needs to purchase 7 notebooks at </em>
<em>$2.99 each and 5 pencils at $0.79 each. </em>
<u><em>To Find:</em></u>
<em>About how much will Samantha spend before sales tax?</em>
<u><em>Solution:</em></u>
<em>All we have to do is multiply and then add. </em>
<em>Starting with NoteBook;</em>
<em>Since each notebook cost - $2.99</em>
<em>Then 7 Notebook..</em>
<em>7 × $2.99</em>
<em>= $20.93</em>
<em>Now with Pencil;</em>
<em>Since each pencil cost - $0.79</em>
<em>Then 5 Pencil..</em>
<em>5 × 0.79</em>
<em>= $3.95</em>
<em>As a result, we add both together</em>
<em>$20.93 + $3.95</em>
<em>=$24.88</em>
<u><em>RevyBreeze~</em></u>
Step-by-step explanation:
You asked a question similar to this recently. This time I will show the multiplication and subtraction method instead of the substitution one.
2x-5y=-5 | x+2y=11
2x-5y=-5 | 2x+4y=22
Subtract the first equation form the second.
9y=27
y=3
Then substitute.
x+2(3)=11
x+6=11
x=5
The final answer is the ordered pair (5,3).