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2 years ago

A sprinter can run 240 feet in 8 seconds. Find the sprinter's unit rate of feet per second.

Mathematics

2 answers:

Ivenika [448]2 years ago

6 0

30 in seconds that is the answer

pshichka [43]2 years ago

6 0

Answer:

unit rate is 30 feet per second

Step-by-step explanation:

A sprinter can run 240 feet in 8 seconds.

we need to find the sprinter's unit rate of feet per second.

to find feet per second , divide feet by the seconds

given : 240 feet in 8 seconds

$\frac{feet}{second} = \frac{240}{8} =30$

So unit rate is 30 feet per second

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Alternative hypothesis: $\mu_1 > \mu_2$

The statistic is given by:

$t= \frac{\bar X_1 -\bar X_2}{\sqrt{\frac{s^2_1}{n_1} +\frac{s^2_2}{n_2}}}$

And replacing we got:

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And the best option would be:

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Step-by-step explanation:

We have the following info given:

n1 = 150 n2 = 275

$\bar x_1 = 72.86, \bar x_2 = 67.34$

s1 = 15.98 s2 = 35.67

We want to test the following hypothesis:

Null hypothesis: $\mu_1 \leq \mu_2$

Alternative hypothesis: $\mu_1 > \mu_2$

The statistic is given by:

$t= \frac{\bar X_1 -\bar X_2}{\sqrt{\frac{s^2_1}{n_1} +\frac{s^2_2}{n_2}}}$

And replacing we got:

$t=\frac{72.86-67.34}{\sqrt{\frac{15.98^2}{150} +\frac{35.67^2}{275}}}=2.194$

And the best option would be:

2.19

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2 years ago