The reading speed of second grade students is approximately

The reading speed of second grade students is approximately normal, with a mean of 92 words per minute(wpm) and a standard deviation of 10 wpm.

2. What is the probability that a random sample of 11 second grade students results in a mean reading rate of more that 96 words per minute? The probability is? (round to four decimal places as needed

Solution

Mean = 92 and sigma = 10

Sample size = 11

Std error of sample = 10/rt 11 = 3.015

Mean difference = 96-92 = 4

Reqd prob = P(Z>4/3.015)

= P(Z>1.3266)

=0.0918