Question

1. The reading speed of second grade students is approximately normal with a mean of 90 words per minute (wpm) and a standard deviation of 10 wpm. A. What is the probability a randomly selected student will read more than 95 words per minute? B: What is the probability that a random sample of 12 second grade students results in a mean reading rate of more than 95 words per minute? c: What is the probability that a random sample of 24 second grade students results in a mean reading rate of more than 95 words per minute? D: What effect does increasing the sample size have on the probability? Provide an explanation for this result. E: A teacher instituted a new reading program at school. After 10 weeks in the program, it was found that the mean reading speed of a random sample of 20 second grade students was 92.8 wpm. What might you conclude based on this result? f. There is a 5% chance that the mean reading speed of a random sample of 20 second grade students will exceed what value? could you please explain in details step by step. I totally do not understand this question. If you have links to videos please share.

Answer 1