See staff for ayerT Statistical Methods Friday Quiz: Chapter 6a QUIZ Time Remain
ID: 3340814 • Letter: S
Question
See staff for ayerT Statistical Methods Friday Quiz: Chapter 6a QUIZ Time Remaining: 00 4151 Submit This Question: 1 pt This Quiz: 10 pts pos In a certain state, the recent average critical reading standardized test score was 511. Assume that the standard deviation is 100 and that standardized test scores are Normally distributed. Complete parts (a) and (b) below. Include a Normal curve for each part a. What percentage of standardized test takers scored 550 or less? Choose the Normal curve that represents the percentage of st scored 550 or less. ed test takers that O A. O B. O C. O D. 3 The percentage of standardized test takers who scored 550 or less is Type an integer or decimal rounded to one decimal place as needed.) b. What percentage of standardized test takers scored less than 511? Choose the Normal curve that represents the percentage of standardized test takers that scored less than 511 OD. A.Explanation / Answer
a)
For 550 or less Option D curve is currect
as = 511 and = 100
Z Score is
Z = (X - ) /
Z = (550 - 511) / 100
Z = 0.39
From Zscore table Percentage is 65.17%
B)
Curve is option B.
Z = (X - ) /
Z = (511 - 511) / 100
Z = 0
From z score table is 50%