Between 2 and 3, should be somewhere before .5
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:
Option C is true.
Step-by-step explanation:
See the attached diagram.
Since MN is a diameter of the circle at P, so it will always make a right angle at a point on the circumference of the circle.
Therefore, ∠ MLN = 90° as L is a point on the circumference.
Now, given that LM = 2x and LN = 3x, then we have to find MN.
So, applying Pythagoras Theorem, MN² = LM² + LN²
⇒ MN² = 4x² + 9x² = 13x²
⇒ MN = x√13
Therefore, option C is true. (Answer)
123x - 23(-1 + x) = 14
Simplify.
123x + 23 - 23x = 14
Subtract 23 from both sides.
123x - 23x = 14 - 23
Simplify.
100x = - 9
Divide both sides by 100.
x = -9/100
~Hope I helped!~
