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Diano4ka-milaya [45]
3 years ago
11

An athlete runs a 600-meter course in 150 seconds. Find the average speed of the athlete. Round to the nearest tenth if necessar

y.
Mathematics
2 answers:
Usimov [2.4K]3 years ago
8 0
The average speed of the athlete is 4 meters per second.
sineoko [7]3 years ago
6 0

The formula for average speed is distance/time.

600/150 is 4 meters per second.

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A researcher is going to estimate the average typing speed of students of a college. He selects a random sample of 20 students a
Stella [2.4K]

Answer:

The margin of error of the 90% confidence interval of a student's average typing speed is of 1.933 wpm.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 20 - 1 = 19

90% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 19 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.9}{2} = 0.95. So we have T = 1.7291

The margin of error is:

M = T\frac{s}{\sqrt{n}}

In which s is the standard deviation of the sample and n is the size of the sample. For this question, we have s = 5, n = 20. So

M = T\frac{s}{\sqrt{n}}

M = 1.7291\frac{5}{\sqrt{20}}

M = 1.933

The margin of error of the 90% confidence interval of a student's average typing speed is of 1.933 wpm.

8 0
3 years ago
Help pleaseeeeeee!!!!!!
Archy [21]

Answer:

5x + 100

Step-by-step explanation:

(2x + 6) x 2 = 4x + 12

14x + 8 - 4x + 12 =

10x + 20 / 2 =

5x + 100

Hope that helps!

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Did you hear about the two punsters who told a lot of jokes about cats
Serggg [28]
Ooo. I I didn't hear please do tell
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The function g(t) = 2t represents the number of guitar lessons, g(t), you can complete in t months. How many guitar lessons can
Georgia [21]
The number of guitar lessons that can be completed in 7 months is 2(7) = 14.
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3 years ago
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alekssr [168]

Answer:

X = 0.9

Step-by-step explanation:

\frac{2.7}{5.1}  =  \frac{x}{1.7}  \\   \frac{2.7 \times 1.7}{5.1}  = x \\ x = 0.9

5 0
3 years ago
Read 2 more answers
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