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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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Officials project that between 2010 and 2050, the population of a certain city will drastically change. The model below gives th
MaRussiya [10]

Answer:

In the year 2010, the population of the city was 175,000

Step-by-step explanation:

If we rewrote this as a linear expression in standard form (it is linear, btw), it would look like this:

P(t)=\frac{11}{2}t+175

The rate of change, the slope of this line, is 11/2.  If the year 2010 is our time zero (in other words, we start the clock at that year), then 0 time has gone by in the year 2010.  In the year 2011, t = 1 (one year goes by from 2010 to 2011); in the year 2012, t = 2 (two years have gone by from 2010 to 2012), etc.  If we plug in a 0 for t we get that y = 175,000.  That is our y-intercept, which also serves to give us the starting amount of something time-related when NO time has gone by.

3 0
3 years ago
For the set A=
umka2103 [35]

Answer:

  a)  A = {-3, -2, -1}

  b)  n(A) = 3

  c)  A is finite

Step-by-step explanation:

a) The elements of A are the integers between -4 and 0, not including those values. Those integers are -3, -2, -1, so those are the elements of set A.

  A = {-3, -2, -1}

__

b) n(A) is the number of elements in set A. Obviously, there are 3:

  n(A) = 3

__

c) Since n(A) is not "infinity", the set A is finite.

7 0
3 years ago
Hep me please and thx u
zubka84 [21]

Answer:

what do i dohere?

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
)<br> Write an exponential decay<br> equation with a rate of 25% and<br> an initial value of 6.
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3 years ago
Let f(x)=x^2 and g(x)=(x-3)^2+7 match up the correct transormations that are needed to transform the graph of f(x) to the graph
pentagon [3]

The transformations are vertical translation 7 units up.horizontal translation 3 units to the left

We have given that the equations

let f(x)=x^2 and g(x)=(x-3)^2+7

We have to determine the correct transformation,

<h3>What is the vertical translation?</h3>

Vertically translating a graph is equivalent to shifting the base graph up or down in the direction of the y-axis. A graph is translated to k units vertically by moving each point on the graph k units vertically.

Notice that the addition of 2 units to the variable x in the exponent involves a horizontal shift to the left in 2 units.

Notice as well that subtraction of 4 units to the functional expression involves a vertical shift downwards in 4 units.

To learn more about the transformation visit:

brainly.com/question/2689696

#SPJ1

5 0
2 years ago
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