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2 answers:
Answer:
- Minimum 2 hours
Step-by-step explanation:
Sunset Canyon Bikes charges $1.50 per hour and a $8.00 rental fee.
<u>Equation:</u>
- y = 1.5x + 8
Blue Canyon Bikes charges $3.50 per hour and a $4.00 rental fee
<u>Equation:</u>
- y = 3.5x + 4
The second equation has a greater slope so beyond the intersection of the lines the Sunset Canyon Bikes will have lower price.
<u>The point of intersection is:</u>
- 1.5x + 8 = 3.5x + 4
- 3.5x - 1.5x = 8 - 4
- 2x = 4
- x = 2 hours
The graph is attached, where the red line is the first equation and the blue line is the second one.
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Answer:
0.0314 = 3.14% probability that it takes at most 1 hour of machining time to produce a randomly selected component
Step-by-step explanation:
Normal Probability Distribution:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean and standard deviation
, the z-score of a measure X is given by:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.
Sum of normal variables:
When normal variables are added, the mean is the sum of the means while the standard deviation is the square root of the sum of the variances.
The mean values are 20, 15, and 30 min, respectively:
This means that
The standard deviations are 1, 2, and 1.5 min, respectively.
This means that
What is the probability that it takes at most 1 hour of machining time to produce a randomly selected component?
Mean and standard deviation are in minutes, so this is the pvalue of Z when X = 60.
has a pvalue of 0.0314
0.0314 = 3.14% probability that it takes at most 1 hour of machining time to produce a randomly selected component