+0  
 
0
100
1
avatar

Hogwarts need to order more magic wands with a length of 20 cm.  Since all magic wands are unique, the length varies normally with an average value of 19.7 cm and a standard deviation of 0.4 cm.  What percentage of the wands are expected to be shorter than 19.3 cm?

 May 7, 2021
 #1
avatar+34492 
+1

Average (mean) = 19.7  cm    ONE standad deviation (0.4) below the mean is 19.3 cm

   How many wands are below one standard deviation?

    from z-score table   z = -1    equates to   .1587     or 15.87%

 May 7, 2021

16 Online Users

avatar
avatar