80 U2 songs (in seconds) were selected at random. Assume that the data is normally distributed and that the bands entire collection of songs has a mean and standard deviation equal to those calculated(mean=289.7 or 290, standard deviation= 76.8 or 77). What percentage of U2 songs are expected to be

Question

A.) over 180 seconds
B.) between 210 seconds and 300 seconds
C.) Under what length of time are 90% of all U2 songs expected to be?
Thanks in advance

Answer 1

you can enter your data at

http://davidmlane.com/hyperstat/z_table.html