Welcome :: Homework Help and Answers :: Mathskey.com
Welcome to Mathskey.com Question & Answers Community. Ask any math/science homework question and receive answers from other members of the community.

13,435 questions

17,804 answers

1,438 comments

774,869 users

The scores of students had a normal distribution

0 votes

The scores of students had a normal distribution with μ=548.6 and σ=28.4 (a) What's the prob. that a student's test scores 555 or higher?

asked Oct 19, 2017 in STATISTICS by anonymous

1 Answer

0 votes
Standard score: z = (x - μ)/σ = (555 - 548.6) / 28.4 = 0.225
 
Now standard normal table to find Φ(0.225) = 0.589
 
P(x<555)=0.589
 
Calculate probability that a student's test scores 555 or higher.
 
P(x≥555) =1-P(x<555)=1-0.589 =0.411
answered Oct 23, 2017 by lilly Expert
reshown Oct 23, 2017 by bradely

Related questions

...