2. The scores in an IQ test are normally distributed. The test has a mean of 100 and a standard deviation of 10.
a. If there are 500 people who took the test, how many scored between 90 and 110?
a. If there are 500 people who took the test, how many scored between 90 and 110?
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Answer:
90-100=-10, -10/10=-1 Z=-1 area= 0.3413 hindi sya negative kasi walang area na negative, pag z score lng meron.
110-100=10, 10/10= 1 Z= 1 area= 0.3413
0.3413 + 0.3413 = 0.6826
pinag plus yung dalawang area kasi ang hinahanap natin is between ng 90 at 110.
0.6826x 500= 341.30 people who took the test
ito nmn po formula para sa raw score, Raw score = μ + zσ