Answer:
The right answer is the fourth one, 11,66.
Step-by-step explanation:
answer is 5/6
Step-by-step explanation:
multiplying by 60, we get,
50=15+42x
we can simplify it, 42x= 35,or x=5/6
The average score is 500 points and the standard deviation is 50 points.Mean - 2 SD = 500 - 2 * 50 = 500 - 100 = 400It means that more than 400 on the standardized test is more than: Mean - 2 Standard deviations.For the Normal distribution: 100% - 2.5 % = 97.5% = 0.975.Answer: The probability that student scores more than 400 points is 0.975.