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3 years ago

15

An athlete ran 1,200 laps around a track over a two month period. He ran 4 times the number of laps in the second month than he

ran in the first month. How many laps did the athlete run in the first month?

1 answer:

Tema [17]3 years ago

3 0

Your answer should be 3600<span />

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Below are tabulated a number of Rockwell G hardness values that were measured on a single steel specimen. Compute

Mashcka [7]

Answer:

a) 48.408

b) 1.235

Step-by-step explanation:

a)

The average hardness value xbar can be computed as

xbar=sum of values/number of values

xbar=(46.5+46.9+49.4+50.3+49.8+48.8+47+47.7+48.3+49.4+47.8+49)/12

xbar=580.9/12

xbar=48.408 (rounded to 3 decimal places).

The average hardness value is 48.408.

b)

The standard deviation hardness value s can be computed as

$s=\sqrt{\frac{sum(x-xbar)^2}{n-1} }$

x x-xbar (x-xbar) ²

46.5 -1.90833 3.64174

46.9 -1.50833 2.27507

49.4 0.99167 0.98340

50.3 1.89167 3.57840

49.8 1.39167 1.93674

48.8 0.39167 0.15340

47.0 -1.40833 1.98340

47.7 -0.70833 0.50174

48.3 -0.10833 0.01174

49.4 0.99167 0.98340

47.8 -0.60833 0.37007

49.0 0.59167 0.35007

Total 16.7692

$s=\sqrt{\frac{16.7692}{12-1} }$

$s=\sqrt{\frac{16.7692}{11} }$

$s=\sqrt{1.5245}$

$s=1.2347$

s=1.235 (rounded to 3 decimal places)

The standard deviation hardness value is 1.235.

4 0

4 years ago

Write 0.21 repeted as a fraction in simplest form.<br> 0.21

Jlenok [28]

Answer:

Below is the answer in the simplest form possible: 0. 21 repeating as a fraction = 7/33 Decimal Repeating as a Fraction Calculator

6 0

3 years ago

Eight ones six tens what is the answer

Zielflug [23.3K]

Eight ones = 8
Six tens= 60
60 + 8 = 68

6 0

3 years ago

Read 2 more answers

Father's age is 3 times the sum of ages of his two children. After 5 years his age will be twice the sum of ages of two children

ra1l [238]

Answer:

45 is the father's age

Step-by-step explanation:

7 0

3 years ago

What happens when warm air collides with cold air and is forced to rise over cold dome.

igor_vitrenko [27]

Answer:

Something to raise the moist air to form the clouds and cause precipitation. An example of lift is warm air colliding with cold air and being forced to rise over the cold dome. The boundary between the warm and cold air masses is called a front.

Step-by-step explanation:

6 0

3 years ago