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Mice21 [21]
3 years ago
14

Suppose the test scores of students in a class are normally distributed with a mean of 86 and a standard deviation of 4. What is

the z-score for a student that scored 76 on a test? A.−4 .−2.5 C.2.5 D.4
Mathematics
1 answer:
WARRIOR [948]3 years ago
4 0

Answer:

-2.5

Step-by-step explanation:

Here in this question, we are interested in calculating the z-score for a student that had a particular mark at the test

To calculate the z-score, we need to use a mathematical formula

Mathematically;

z-score = (x - mean)/SD

From the question;

x = 76

mean = 86

standard deviation SD = 4

Plugging these values in the equation, we have;

z-score = (76-86)/4 = -10/4 = -2.5

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Either enter an exact answer in terms of \piπpi or use 3.14, point, 14 for \piπpi and enter your answer as a decimal.
OverLord2011 [107]

Answer:

49π sq. units

Step-by-step explanation:

Find the diagram attached

We can find the area of the given circle

Given

diameter of the circle d = 14

Area of the circle = πd²/4

Substitute the given diameter

Area of the circle = π(14)²/4

Area of the circle = 196π/4

Area of the circle = 49π sq. units

Hence the exact answer in terms of π is 49π sq. units

4 0
2 years ago
Can someone help me with this question? Thank you! ​
Natali [406]

Answer:

11

Step-by-step explanation:

22 is the largest number you are given in this diagram. 0 is the smallest. that would be your first step.

Next think about it as if you already know your midpoint, as in, midpoint being half of your ending value.

Lastly, you want to divide 22 in half, since midpoint is half of your line segment, and then answer you get is 11

3 0
3 years ago
(3t + 7)−2(6.3t + 4) *<br><br> 15.6t − 1<br> 15.6t + 15<br> −9.6t + 15<br> −9.6t - 1
vodka [1.7K]

Answer:the anser is -9.6t-1

Step-by-step explanation:

8 0
2 years ago
Says the directions in the picture.<br> Please help me before my next geometry class tomorrow.
SashulF [63]
Distance formula= [(x2-x1)^2 + (y2-y1)^2]^1/2
Origin= white house = (0,0)
Capitol= (2300,800) 
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(2300² + 800² )^1/2
= 2435 meters
Thus distance is 2435 m
3 0
3 years ago
Find the area of the following<br> parallelogram:<br> 1.5 cm<br> 2.5 cm<br> 2.25 cm<br> A= [?] cm
Serggg [28]

Answer:

given,

base (b) = 2.25cm

height (h) = 1.5 cm

now,

area (a) = b×h

or, a=2.25cm×1.5cm

therefore the area of parallelogram is 3.375cm^2.

<em>hope</em><em> </em><em>it</em><em> </em><em>helps</em><em>.</em><em>.</em>

7 0
2 years ago
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