Answer:
<h2>y=60+25h+0.3r</h2>
Step-by-step explanation:
let y be the total charges
given that the hour is h
and the cost for raw material is r
therefore
1. The first hour of service call = $60
2. For each additional hour= 25h
3. 30% over the cost of the materials.= 30/100*r=0.3r
total charges
y=60+25h+0.3r
therefore the expression is
y=60+25h+0.3r
99% confidence limits
for population proportion is:
CL = P +- Z * √(P*(1-P)/N))
Where:
P = sample proportion
Z = Z-score taken at 99%
confidence = 2.575
N = sample size
Calculating for the
values:<span>
P = 350/500 = 0.7
N = 500 </span>
Substituting know values
to the CL equation:
<span>CL = 0.7 +- 2.575* </span>√<span>(0.7*(1-0.7)/500))</span>
<span>CL = 0.647 , 0.753</span>
<span>
</span>
<span>Therefore confidence limits range from 0.647 to 0.753.</span>
Manav can cover 1 mile of the distance in just 12 minutes.
<h3>How to calculate the unit rate?</h3>
The unit rate can be expressed in any unit for instance minute per mile, miles/hour, etc
if Manav covers 3 miles in 36 minutes, her unit rate in minutes per mile is expressed as:
Unit rate = 36min/3miles
Unit rate = 12 minutes/mile
Here,
This shows that Manav can cover 1 mile of the distance in just 12 minutes.
Learn more on unit rate here:
brainly.com/question/2375289
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