NEED HELP ASAP, WILL GIVE BRAINLIEST
2 answers:
9514 1404 393
Answer:
B) -31
A) ellipse
Step-by-step explanation:
In the form ...
Ax² +Bxy +Cy² +Dx +Ey +F = 0
The discriminant is ...
B² -4AC
The interpretation is ...
- < 0 ⇒ ellipse, possibly a circle
- = 0 ⇒ parabola
- > 0 ⇒ hyperbola
Any of the figures may be degenerate.
__
Here, the discriminant is ...
5² -4(-2)(-7) = -31
The equation represents an ellipse.
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=> The answer is <u>2</u><u>.</u>
We have been given that the ages of students in a school are normally distributed with a mean of 15 years and a standard deviation of 2 years.
We are asked to find the percentage of students that are between 14 and 18 years old.
First of all, we will find z-score corresponding to 14 and 18 using z-score formula.
Similarly, we will find the z-score corresponding to 18.
Now we will find the probability of getting a z-score between and
that is
.
Using normal distribution table, we will get:
Let us convert into percentage.
Therefore, approximately of the students are between 14 and 18 years old.