Answer: 0.6827
Step-by-step explanation:
Given : Mean IQ score :
Standard deviation :
We assume that adults have IQ scores that are normally distributed .
Let x be the random variable that represents the IQ score of adults .
z-score :
For x= 90
For x= 120
By using the standard normal distribution table , we have
The p-value :
Hence, the probability that a randomly selected adult has an IQ between 90 and 120 =0.6827
When you write an equation in the slope-intercept form
the two coefficients m and b represent, respectively, the slope and the intercept.
So, in your case, m=1/4 and b= -7, which leads to the equation
Standard form for the equation of the line is
Solution:
Given point is (2, –5).
slope of the line m =
Here,
Equation of a line passing through the point:
Subtract 15 from both sides of the equation.
Standard form for the equation of the line is