Match the following exponential functions with their "b" value.
1 answer:
9514 1404 393
Answer:
in order by function: 0.6, 8, 7/3, 2, 1/2
Step-by-step explanation:
The functions are given in the form ...
f(x) = a·b^x
The "b" value is the value immediately to the left of the exponent. (It's not rocket science; it's pattern matching.) Note that the minus sign in g(x) is part of 'a', not part of 'b'.
From the top-down, the functions listed on the left have the b-values shown above.
You might be interested in
The sum of squares of numbers is: 13
Step-by-step explanation:
Let x and y be two numbers
Then,
Difference of the squares of the numbers will be:
Product will be:
Given identity is:
Given values are:
Difference of the squares of the numbers=
Product of numbers = xy = 6
Putting the values in the identity
As we have to only find x^2+y^2
Taking square root on both sides
The sum of squares of numbers is: 13
Keywords: Identities
Learn more about identities at:
#LearnwithBrainly
Answer:
A. P(x>91.71)=0.10, so the minimum grade is 91.71
B. P(x<72.24)=0.025 so the maximum grade could be 72.24
C. By rule of three, 200 students took the course
Step-by-step explanation:
The problem says that the grades are normally distributed with mean 84 and STD 6, and we are asked some probabilities. We can´t find those probabilities directly only knowing the mean and STD (In that distribution), At first we need to transfer our problem to a Standard Normal Distribution and there is where we find those probabilities. We can do this by a process called "normalize".
P(x<a) = P( (x-μ)/σ < (a-μ)/σ ) = P(z<b)
Where x,a are data from the original normal distribution, μ is the mean, σ is the STD and z,b are data in the Standard Normal Distribution.
There´s almost no tools to calculate probabilities in other normal distributions. My favorite tool to find probabilities in a Standard Normal Distribution is a chart (attached to this answer) that works like this:
P(x<c=a.bd)=(a.b , d)
Where "a.b" are the whole part and the first decimal of "c" and "d" the second decimal of "c", (a.b,d) are the coordinates of the result in the table, we will be using this to answer these questions. Notice the table only works with the probability under a value (P(z>b) is not directly shown by the chart)
A. We are asked for the minimum value needed to make an "A", in other words, which value "a" give us the following:
P(x>a)=0.10
Knowing that 10% of the students are above that grade "a"
What we are doing to solve it, as I said before, is to transfer information from a Standard Normal Distribution to the distribution we are talking about. We are going to look for a value "b" that gives us 0.10, and then we "normalize backwards".
P(x>b)=0.10
Thus the chart only works with probabilities UNDER a value, we need to use this property of probabilities to help us out:
P(x>b)=1 - P(x<b)=0.10
P(x<b)=0.9
And now, we are able to look "b" in the chart.
P(x<1.28)=0.8997
If we take b=1.285
P(x<1.285)≈0.9
Then
P(x>1.285)≈0.1
Now that we know the value that works in the Standard Normal Distribution, we "normalize backwards" as follows:
P(x<a) = P( (x-μ)/σ < (a-μ)/σ ) = P(z<b)
If we take b=(a+μ)/σ, then a=σb+μ.
a=6(1.285)+84
a=91.71
And because P(x<a)=P(z<b), we have P(x>a)=P(z>b), and our answer will be 91.71 because:
P(x>91.71) = 0.1
B. We use the same trick looking for a value in the Standard Normal Distribution that gives us the probability that we want and then we "normalize backwards"
The maximum score among the students who failed, would be the value that fills:
P(x<a)=0.025
because those who failed were the 2.5% and they were under the grade "a".
We look for a value that gives us:
P(z<b)=0.025 (in the Standard Normal Distribution)
P(z<-1.96)=0.025
And now, we do the same as before
a=bσ+μ
a=6(-1.96)+84
a=72.24
So, we conclude that the maximum grade is 72.24 because
P(x<72.24)=0.025
C. if 5 students did not pass the course, then (Total)2.5%=5
So we have:
2.5%⇒5
100%⇒?
?=5*100/2.5
?=200
There were 200 students taking that course
