Tyra subscribes to an online gaming service that charges a monthly fee of
1 answer:
Answer:
C) C(x) = 5 +0.25x
Step-by-step explanation:
Let
C(x) ---> the total cost monthly
x ---> is the number of hours in a month
we know that
he linear equation in slope intercept form is given by
where
m is the slope or unit rate
b is the y-intercept or initial value
In this problem we have
The slope is equal to
The initial value or y-intercept is equal to
substitute
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Using the normal distribution, it is found that 25.14% of the batteries will last more than 420 hours.
<h3>Normal Probability Distribution</h3>The z-score of a measure X of a normally distributed variable with mean and standard deviation
is given by:
- The z-score measures how many standard deviations the measure is above or below the mean.
- Looking at the z-score table, the p-value associated with this z-score is found, which is the percentile of X.
In this problem, we have that the mean and the standard deviation are given, respectively, by:
.
The proportion of the batteries will last more than 420 hours is <u>one subtracted by the p-value of Z when X = 420</u>, hence:
Z = 0.67
Z = 0.67 has a p-value of 0.7486.
1 - 0.7486 = 0.2514.
0.2514 = 25.14% of the batteries will last more than 420 hours.
More can be learned about the normal distribution at brainly.com/question/24663213
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