Peter jogs 3 miles in 27 minutes. Find the unit rate in minutes per mile.
2 answers:
Answer: 1 mile per 9 minutes or 9 minutes per mile
Step-by-step explanation: "Per mile" means in 1 mile so we can rewrite the given statement using fractions.
To find out what goes in the blank, notice that we have a 1 in the denominator of our second fraction so we want to find a fraction that is equivalent to 27/3 that has a 1 in the denominator.
If we divide the numerator and denominator of 27/3 by 3, we get the equivalent fraction 9/1 or 9 minutes over 1 mile.
So now we have 9 minutes over 1 mile = ___ minutes over 1 mile.
So a 9 must go in the blank.
Therefore, the unit rate for 3 miles in 27 minutes is 1 mile per 9 minutes or 9 miles in 1 minute.
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Step-by-step explanation:
Mean time spent watching TV (μ) = 2.8 hours a day
Standard deviation (σ) = 1.5 hours a day
The 90th percentile (upper 10%) of a normal distribution has an equivalent z-score of roughly z = 1.282. The minimum time spent watching TV, X, at the 90th percentile is:
On a typical day, you must watch at least 4.72 hours of TV to be in the upper 10%.