The reading speed of second grade students in a large city is approximately normal, with a mean of 90 words per minute (wpm) a
nd a standard deviation of 10 wpm. complete parts (a) through (f). (a) what is the probability a randomly selected student in the city will read more than 96 words per minute?
Given : The reading speed of second grade students in a large city is approximately normal, with a mean of words per minute (wpm) and a standard deviation of wpm.
Let x be the random variable that represents the reading speed of second grade students.
z-score :
For x= 96 words per minute
Now, the probability a randomly selected student in the city will read more than 96 words per minute will be :-
Hence, the probability a randomly selected student in the city will read more than 96 words per minute = 0.2743
Using a z-table (http://www.z-table.com) we see that the area to the left of this, less than this score, is 0.7257. This means the area greater than this would be 1-0.7257 = 0.2743.
You will start off by making the 6 in the ones place a 16 since you can't subtract 6-8 and change the 6 in the tens to a 5 since you borrowed. Hope this helps! :)