The scores of adults on an iq test is approximately normal with mean 100 and standard deviation 15. Corinne scores 118 on such test. Her z-score is about

z - score is 1.2

Step-by-step explanation:

We are given that the scores of adults on an IQ test is approximately normal with mean 100 and standard deviation 15 in which Corinne scores 118 .

So, z-score value is given by the formula, Z = , where ; = Mean  and = standard deviation

Therefore, z - score of Corinne = = 1.2 .

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct