Correct Answer:Option A. 0.01
Solution:This is a problem of statistics and uses the concept of normal distributions. We need to convert the score of 90 into z-score and then find the desired probability from standard normal distribution table.
Converting 90 to z-score:
Now we are to find the probability of z score being more than 2.33. From the z-table the probability comes out to be 0.01.
Therefore, we can conclude that the probability of class average is greater than 90 is 0.01.
The slope of parallel lines are the same and the slope of perpendicular lines are negative reciprocal
example: parallel, slope line 1: 2 slope line 2: 2
perpendicular, slope line 1: 2 slope line 2: -1/2
statements 1, 3, 4 are correct