Answer:
21 people
Step-by-step explanation:
Lets define x as =). If x is 14, 1.5x will be 21.
The number . . . . . . . . . . . . . . K
Three more than the number . . . K + 3
The product of 10 and
three more than the number . . . 10(K + 3)
Ok so what I did was "<span>-0.1 + 19.1 = 19.0" so x=19.0. Hope that helps.</span>
Answer:
a) Percentage of students scored below 300 is 1.79%.
b) Score puts someone in the 90th percentile is 638.
Step-by-step explanation:
Given : Suppose a student's score on a standardize test to be a continuous random variable whose distribution follows the Normal curve.
(a) If the average test score is 510 with a standard deviation of 100 points.
To find : What percentage of students scored below 300 ?
Solution :
Mean ,
Standard deviation
Sample mean
Percentage of students scored below 300 is given by,
Percentage of students scored below 300 is 1.79%.
(b) What score puts someone in the 90th percentile?
90th percentile is such that,
Now,
Score puts someone in the 90th percentile is 638.