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1 answer:
Answer:
Step-by-step explanation:
Let's solve your system by substitution.
3x−2y=7;y=x+2
Rewrite equations:
y=x+2;3x−2y=7
Step: Solvey=x+2for y:
y=x+2
Step: Substitutex+2foryin3x−2y=7:
3x−2y=7
3x−2(x+2)=7
x−4=7(Simplify both sides of the equation)
x−4+4=7+4(Add 4 to both sides)
x=11
Step: Substitute11forxiny=x+2:
y=x+2
y=11+2
y=13(Simplify both sides of the equation)
Answer:
x=11 and y=13
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Answer:
99.7% of customers have to wait between 8 minutes to 30 minutes for their food.
Step-by-step explanation:
We are given the following in the question:
Mean, μ = 18 minutes
Standard Deviation, σ = 4 minutes
We are given that the distribution of amount of time is a bell shaped distribution that is a normal distribution.
Empirical Formula:
- Almost all the data lies within three standard deviation from the mean for a normally distributed data.
- About 68% of data lies within one standard deviation from the mean.
- About 95% of data lies within two standard deviations of the mean.
- About 99.7% of data lies within three standard deviation of the mean.
Thus, 99.7% of the customers have to wait:
Thus, 99.7% of customers have to wait between 8 minutes to 30 minutes for their food.