The scores of the students on a standardized test are normally distributed with a mean of 500 and a standard deviation of 110 what is the probability that a randomly selected student has a test score between 350 and 550 use the portion of the standard normal cable below to answer the question
a. 7%
b. 9%
c. 59%
d. 91%

59%

Step-by-step explanation:

Mean =

Standard deviation =

We are supposed to find 0 what is the probability that a randomly selected student has a test score between 350 and 550

Formula :

at x = 350

at x = 550

So, P(-1.36<z<0.454)

P(z<0.45)-P(z<-1.36)

Using z score table

= 0.6736-0.0869

= 0.5867

= 58.6% ≈ 59%

Thus the probability that a randomly selected student has a test score between 350 and 550 is 59%

yes. we do proportions in probabilities.