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ale4655 [162]
3 years ago
14

Scores on a mathematics examination appear to follow a normal distribution with mean of 65 and standard deviation of 15. The ins

tructor wishes to give a grade of ""C"" to students scoring between the 60th and 70th percentiles on the exam. What score represents the 70th percentile score on the mathematics exam?
Mathematics
1 answer:
ahrayia [7]3 years ago
7 0

Answer:

<h2>72,86 ≈ 73</h2>

Step-by-step explanation:

In this case we can use the normal table in which you must find the value 0.7 (in the inside) and then you should find the corresponding z value. After this you should multiply the z value by the standard deviation and then you must at to it the mean. This way you can get the score.

Another option is to use the function NORM.INV in excel where you must pass as arguments the probability (0.7), the mean (65) and standard deviation (15)

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A total of 504tickets were sold for the school play. They were either adult tickets or student tickets. There were 54more studen
LuckyWell [14K]

Answer:

225 adult tickets

Step-by-step explanation:

S: no. of students

A: no. of adults

S = A + 54

S + A = 504

A + A + 54 = 504

2A = 450

A = 225

S = 225 + 54

S = 279

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4 years ago
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LenaWriter [7]
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6 0
3 years ago
-9(x+2)=54 apply the distributive property and simplify ​
Tomtit [17]

Answer:

x = -8

Step-by-step explanation:

-9 (x+2) = 54

-9x - 18 = 54

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x = -8

Hope this helps :)

Let me know if there are any mistakes!!

8 0
4 years ago
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Amiraneli [1.4K]

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6 0
3 years ago
Find the solution of the system of equations. 3x+y=-15 <br>3x+2y=-18
s344n2d4d5 [400]

Answer:

(x, y) ==> (-4, -3)

Step-by-step explanation:

-2(3x + y = -15) ==> -6x - 2y = 30

3x + 2y = -18

-6x - 2y = 30

3x + 2y = -18

-3x = 12

/-3    /-3

x = -4

Now, we solve for y:

-6x - 2y = 30

-6(-4) - 2y = 30

24 - 2y = 30

-24        -24

-2y = 6

/-2    /-3

y = -3

(x, y) ==> (-4, -3)

Hope this helps!

8 0
3 years ago
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