Help needed with this!!!

Mathematics

1 answer:

gulaghasi [49]2 years ago

5 0

2,7) is the answer to this question

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Percentage grade averages were taken across all disciplines at a particular university, and the mean average was found to be 83.

Paha777 [63]

Correct Answer:
Option A. 0.01

Solution:
This is a problem of statistics and uses the concept of normal distributions. We need to convert the score of 90 into z-score and then find the desired probability from standard normal distribution table.

Converting 90 to z-score:

$z= \frac{90-83.6}{ \frac{8.7}{ \sqrt{10}} }=2.33$

Now we are to find the probability of z score being more than 2.33. From the z-table the probability comes out to be 0.01.

Therefore, we can conclude that the probability of class average is greater than 90 is 0.01.

4 0

2 years ago

a plumber charges $52.50 per hour plus a $75.00 service charge your father's firm hires him to fix some leaky pipes find the tot

aleksley [76]

(4.5 x 52.5) + 75 = 311.25

7 0

3 years ago

Read 2 more answers

Hey 20 points for the first person to show work and answer this

Harrizon [31]

Step-by-step explanation:

First, the pizza is 18 inches in diameter, so

$d = 18$

and, because the radium is half of the diameter,

$r = 9$

<u>Note that the units are inches.</u>

Using the equation

$a = \pi r ^{2}$

where a is the area of a circle, we know that the area of the whole pizza is approx.254.5 square inches. Divide by 8 to find the area of 1/8 of a pizza. Each slice will have an area of approx. 32 square inches. For a precise result, the answer is

$a(s)= \frac{(\pi \times 9^{2})}{s}$