Milan1025
23.10.2020 •
Mathematics
Suppose that the mean score for the mathematics test cited in Problem 7 is 610. What is the probability that a random sample of 225 students will have a mean score of more than 625
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Ответ:
Reference from question 7 :
Standard deviation (σ) = 120
Standard Error = 8
0.0304
Step-by-step explanation:
Sample size (n) = 225
Sample mean = 625
Population mean = 610
Using the relation :
Z = (sample mean - population mean) / σ/√n
Z = (625 - 610) / (120/√225)
Z = 15 / (120/15)
Z = 15 / 8
Z = 1.875
P(mean score of more than 625)
P(Z > 1.875) = 1 - p(Z < 1.875)
p(Z < 1.875) = 0.9696
P(Z > 1.875) = 1 - p(Z < 1.875) = 1 - 0.9696 = 0.0304
Ответ:
You plus in x as -6 and you already know that y=5x and you plug in x=-6
It should look like 2(-6)-5(-6)=18