Answer:
The probability that a call last between 4.2 and 4.9 minutes is 0.4599
Step-by-step explanation:
Let X be the length in minutes of a random phone call. X is a normal distribution with mean λ=4.2 and standard deviation σ=0.4. We want to know P(4.2 < X < 4.9). In order to make computations, we will use W, the standarization of X, given by the following formula
We will use 
, the cummulative distribution function of W. The values of are well known and the can be found in the attached file
We conclude that the probability that a call last between 4.2 and 4.9 minutes is 0.4599
If we multiply or divide both sides of an inequality by a negative number, you have to flip the inequality. Hope this helps :)
15 = 3 parts
15 divided by 3 = 5
5 = 1 part
A calls for 5 parts
5 • 5 = 25
Answer: 25 Milliliters
-2+4 is 2/2 is (1,y)
4+0 divided by 2 is 2
coordinate is (1,2)
Answer:
3+2x
Step-by-step explanation:
Distribute the equation out.
1/4(12+8x)
(1/4*12)+(1/4*8x)
Multiple those out to get a new equation
3+2x
You cannot add those together because of the variable. Theres no way of knowing what x equals so this is as far as you can go therefor making the answer 3+2x
