Question

PLEASE urgent!!! Scores on a standardized test are normally distributed with a mean of 258 and a standard deviation of 24. Students who score at least 2.3 standard deviations above the mean receive a certificate. What is the minimum score required to receive the certificate?

282.7
285.0
306.0
313.2

Answer 1

so the median 258 and you have a standard deviation of 24

Answer 2

you need a score 2.3 standard deviations above that median

Answer 3

24*2.3=55.2

Answer 4

and it has to be above so 258+55.2=313.2

Answer 5

THANK YOU! Can you help with:
The weights of books on a library shelf are normally distributed with a mean of 3.6 pounds and a standard deviation of 0.7 pound. Approximately what percent of the books weigh more than 4 pounds?

11%
22%
28%
37%

Answer 6

@recon14193

Answer 7

Nmv it's 28%! Thank you so much!!!