Suppose that the scores on a reading ability test are normally distributed with a mean of 70 and a standard deviation of 8. What proportion of individuals score at most 74 points on this test? Round your answer to at least four decimal places.

Solution:

Let X represent the scores on a reading ability test.

It is provided that $X\sim N(70,8^{2})$ .

Compute the probability that an individuals score is at most 74 points on this test as follows:

$P(X\leq 74)=P(\frac{X-\mu}{\sigma}\leq \frac{74-70}{8})$

$=P(Z$

Thus, the proportion of individuals score at most 74 points on this test is 70%.

4 0

3 years ago

What is the slope of the line whose equation is 2y = 5x + 4? 1) 5 2) 2 3) 5/2 4) 2/5

Romashka [77]

Answer:

3) 5/2

Step-by-step explanation:

2y = 5x + 4

y = 5/2x + 2

slope = 5/2

(y = mx + b, m being slope, b being y intercept)

6 0

3 years ago

an open rectangular box with square ends is fitted with an overlapping lid that covers the top and front face determine the maxi

mario62 [17]

so would it be 8 meters because it has 8 sides

3 0

3 years ago