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jamesgraham577
09.12.2020 •
Mathematics
7) Let the random variable X represent the amount of money Dan makes doing lawn care in a randomly selected week in the summerAssume that is Normal with mean $ 240 and standard deviation $60. the probability that in a randomly selected week, Dan will make less than $255 is :
A. 0.6
B. 0.7
C. 0.8
D.0.9
E. 1
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Ответ:
Option A. 0.6 is the right answer.
Step-by-step explanation:
Given information is:
Mean = $240
SD = $60
The probability of Dan making less than $255 has to be found.
Let x = 255
First of all, we will find the z-score of the given value
Now the z-score table will be used to see the probability of less than 0.25
Using the z-score table, we get:
P(x<0.25) = 0.5987
As the answer choices are rounded off to one decimal place, we will round off our answer to one digit after the decimal point
0.5987 => 0.6
Hence,
Option A. 0.6 is the right answer.
Ответ:
The number N = 26
Step-by-step explanation:
The statement is :
Six less than twice a number is that of that number plus 20
The statement now written in digits as
Let the number be N
So, 2 N - 6 = N + 20
Or, 2 N - N = 20 + 6
Or, N = 26
Hence the number N is 26 Answer