The empirical rule states that in a normal distribution,
68% of data is within 1 std deviation of the mean
95% of data is within 2 std deviation of the mean
99.7% of data is within 3 std deviation of the mean
In this case 95% of the cases would be within two std deviations of the mean
mean - 8 and mean + 8
72 - 8 = 64 and 72 + 8 = 80
then 95% of the scores are between 64% and 80% on the test.
Answer:
2 times
Step-by-step explanation:
Well let's first graph the quadratic equation,
Look at the image below ↓
By looking at the image below we can tell that the graph touches the x axis 2 times at,
<u>(-1,0)</u>
<u>(1 1/3,0)</u>
<em />
<em>Thus,</em>
<em>the parabola touches the x axis twice.</em>
<em />
<em>Hope this helps :)</em>
8%,3/5,7/10 and .8
8% = .08
3/5 = .6
7/10=.7
.8=.8
Answer:
I answered it for u before :D
For the lines to be parallel, the slope must be the same
(y2 - y1) / (x2 - x1) = slope
(7- (-3)) / (b-2) = -2
-2 (b-2) = 10
-2b + 4 = 10
-2b = 6
b = -3
