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
Answer:
Adjusted balance method of financing is least expensive for consumer because it charge interest on the ending balance. This method charge a very low interest rate as the ending balance is small.
Step-by-step explanation:
As compare to average daily balance method, it is quite cheaper. It does not charge on daily basis consumption. Instead it charge on the net balance at the end of each billing cycle.
Answer:
Brad picked 130 apples. Andy picked 45 apples. Krystal picked 115 apples.
Step-by-step explanation:
B = 2Y A = Y - 20 K = Y + 50 B + A + K + Y = 355
130 = 2(65) 45 = 65 - 20 115 = 65 + 50 130 + 45 = 115 + 65 = 355
130 = 130 45 = 45 115 = 115
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