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
Try A
Explaining
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Answer:
expansion
Step-by-step explanation:
Answer:
2(2x+1)(4x−3)
Step-by-step explanation:
GCF = 2
2( 16x^ 2/ 2+−4x/2− 6/2)
2(8x ^2−2x−3)
2(8x ^2 +4x−6x−3)
2(4x(2x+1)−3(2x+1))
2(2x+1)(4x−3)