r = the number of rides
0.75r + 6.50 ≤ 20.00
[They charge $0.75 per ride (r) plus an admission fee of $6.50, and he can spend at most (maximum) $20. This means that he can spend $20 or less]
Your answer is C
Answer:
Out of 8 slices two are a
Could be expressed as 2/8 or 1/4 or 25%
25% is your answer
Step-by-step explanation:
62 is the correct answer of this question
Answer:
Where and
Then we have:
With the following parameters:
Step-by-step explanation:
Previous concepts
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".
Solution to the problem
Let X the random variable that represent the number of cars running a red light of a population, and for this case we know the distribution for X is given by:
Where and
Since the distribution for X is normal then we know that the distribution for the sample mean is given by:
With the following parameters: