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Degger [83]
3 years ago
11

Can someone plz help me with this one problem!!!! I’m bailing timed

Mathematics
2 answers:
dem82 [27]3 years ago
5 0

Answer:

-41, -49, -57, -65, -73, -81, -89

Step-by-step explanation:

pattern is +8 or -8 depending on the direction

Anna71 [15]3 years ago
3 0
-41 and -89 I believe
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In a random sample of 1,000 exams, the average score was 500 points with a standard deviation of 80 points.
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Suppose that 12% of test scores for the unit 1 test were above 85 and 8% were below 70. Assuming a normal
Doss [256]

Answer:

Mean = 78.2

Standard deviation = 5.8

Step-by-step explanation:

Mathematically z-score;

= (x-mean)/SD

From the question;

12% of test scores were above 85

Thus;

P( x > 85) = 12%

P(x > 85) = 0.12

Now let’s get the z-score that has a probability of 0.12

This can be obtained from the standard normal distribution table and it is = 1.175

Thus;

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let’s call the mean a and the SD b

1.175 = (85-a)/b

1.175b = 85 - a

a = 85 - 1.175b ••••••••(i)

Secondly 8% of scores were below 70

Let’s find the z-score corresponding to this proportion;

We use the standard normal distribution table as usual;

P( x < 70) = 0.08

z-score = -1.405

Thus;

-1.405 =( 70-a)/b

-1.405b = 70-a

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Equate the two a

70 + 1.405b = 85 - 1.175b

85 -70 = 1.405b + 1.175b

15 = 2.58b

b = 15/2.58

b = 5.81

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a = 70 + 1.405(5.81)

a = 78.16

So mean = 78.2 and Standard deviation is 5.8

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Answer

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5 0
3 years ago
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