In 2000, 46 %46% of the residents in a large city regularly used newspapers for getting news and this has decreased at an avera
1 answer:
Answer:
Step-by-step explanation:
To model a linear function in slope-intercept form one should determine three main parts of the function P(x): variable, constant and slope.
In this situation, the variable "x" is easily identifiable as the number of years passed after 2000, since the goal of this function is to model yearly decrease.
The constant (C) is the percentage of the population who regularly used newspapers in the year 200, which is stated to be 46%.
The slope(m) should be the rate by which the initial population changes each year, which is -1.9%.
Writting the general formula and substituting the terms defined above yields:
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Answer:
a)
b)
c)
d)
Step-by-step explanation:
Let X the random variable that represent the number of material anomalies occurring in a particular region of an aircraft gas-turbine disk. We know that
The probability mass function for the random variable is given by:
And f(x)=0 for other case.
For this distribution the expected value is the same parameter
,
,
a. Compute both P(X≤4) and P(X<4).
Using the pmf we can find the individual probabilities like this:
b. Compute P(4≤X≤ 8).
c. Compute P(8≤ X).
d. What is the probability that the number of anomalies exceeds its mean value by no more than one standard deviation?
The mean is 4 and the deviation is 2, so we want this probability