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BARSIC [14]
3 years ago
11

A runner's distribution of times for running 1,000 meters has a mean of 4.5 minutes with a standard deviation of 0.75 minutes. O

ne of the runner's times has a z-score of –1.76. What is the runner's time?
Mathematics
2 answers:
Annette [7]3 years ago
3 0

Answer:

The runner’s time is 3.18 minutes

Step-by-step explanation:

Mathematically;

z-score = (x-mean)/SD

In this question, we have the z-score but we want to calculate x

From the question

z-score = -1.76

mean = 4.5 minutes

SD = 0.75 minutes

x = ?

Substituting these values, we have that

-1.76 = (x-4.5)/0.75

0.75(-1.76) = x - 4.5

-1.32 = x - 4.5

x = 4.5 -1.32

x = 3.18

Diano4ka-milaya [45]3 years ago
3 0

Answer:

3.18

Step-by-step explanation:

edg

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5 0
3 years ago
Dr. Cyril conducts a simple random sample of 500 men who became fathers for the first time in the past year. He finds that 23% o
svlad2 [7]

Answer:

The another term for the 4% value is : Margin of error

Step-by-step explanation:

Dr. Cyril conducts a simple random sample of 500 men.

He finds that 23% of them report being unsure of their ability to be good fathers, plus or minus 4%.

Now, the another term for the 4% value is : Margin of error

Means the estimate of father being unsure about his ability would be between 19% and 27%.

When sample size is increased, the margin of error becomes smaller.

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3 years ago
Factor 12x^3 -3x^2=0
AfilCa [17]

Answer:

Step-by-step explanation:

12x³ = 2²·3·x³

The greatest common factor of 12x³ and 3x² is 3x².

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4 0
3 years ago
Read 2 more answers
Each paper clip is 3/4 of an inch long and cost 0.02. Exactly enough paper clips I laid into him to have a total length of 36 in
Artist 52 [7]

Answer:

0.96

Step-by-step explanation:

price of 0.75 inch paper clip = 0.02$

To get price of 36 inches

0.75 --------0.02

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6 0
3 years ago
What is the measure of arc ADB? What is the length of arc ADB? What is the area of the shaded region?
FrozenT [24]
What is the measure of arc ADB?
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 theta = 360-90
 theta = 270 degrees

 What is the length of arc ADB? 

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 s = R * theta
 Substituting values:
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 s = 70.69 m

 What is the area of the shaded region?

 The area of the shaded region is:
 A = (s' / s) * (pi) * (r ^ 2)
 Substituting values:
 A = (270/360) * (3.14) * (15 ^ 2)
 A = 529,875 m ^ 2
8 0
4 years ago
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