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mestny [16]
3 years ago
10

The endurance of both track athletes and gymnasts is recorded in terms of maximum volume of oxygen and is measured in milliliter

s per kilogram of body weight per minute.
Track Athletes Gymnasts
89.2 72.1
45.3 78.5
89.1 66.2
57.3 47.3
61.5 63.1
80.1 89.3
47.2 65.3

What is the difference of means, rounded to the nearest hundredth, for the two groups?

A. Dx = 1.73
B. Dx = 1.69
C. Dx = 67.1
D. Dx = 68.7
Mathematics
1 answer:
Olin [163]3 years ago
4 0
The mean of the track athletes is given by
\frac{89.2+45.3+89.1+57.3+61.5+80.1+47.2}{7}=67.1

The mean of the gymnasts is given by
\frac{72.1+78.5+66.2+47.3+63.1+89.3+65.3}{7}=68.8

The difference in mean is given by
68.8-67.1=1.73 (rounded to one decimal place)

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Can someone explain this? :)
Alchen [17]

I'll do part (a) to get you started.

The angle 'a' pairs up with the 123 degree angle as a corresponding angle pair. Due to the parallel lines, the corresponding angles are congruent. Therefore a = 123.

We also see that b = 123 as well since a = b (they are vertical angles).

Notice how angle c is adjacent to the 123 degree angle. These two angles form a straight line, so they must add to 180 degrees.

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-------------------------

To summarize, we have these three angles

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White raven [17]

Answer:

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