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zloy xaker [14]
3 years ago
8

While driving on the highway, Dave averages 60 miles per hour. In the city, he averages 30 miles per hour. On a trip to his gran

dmother's house, Dave drives 235 hours on the highway and 115 hours in the city. What is Dave's average speed for the entire trip to his grandmother's house? Round to the nearest tenth.
Mathematics
2 answers:
Goshia [24]3 years ago
8 0
Approximately 50 miles per hour
Tasya [4]3 years ago
7 0
Dave arrived to his grandmother's hours in7.75 hours.
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maksim [4K]

Answer:

The 95% CI for the difference of means is:

-155.45 \leq \mu_1-\mu_2 \leq -44.55

Step-by-step explanation:

<em>The question is incomplete:</em>

<em>"Find a 95% confidence interval on the difference of the towels mean absorbency produced by the two processes. Assumed that the standard deviations are estimated from the data. Round to two decimals places."</em>

Process 1:

- Sample size: 10

- Mean: 200

- S.D.: 15

Process 2:

- Sample size:  4

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The difference of the sample means is:

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The standard deviation can be estimated as:

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The degrees of freedom are:

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The t-value for a 95% confidence interval and 12 degrees of freedom is t=±2.179.

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