Math Question: 5. The reading speed of sixth-grade students is approximately normal with a mean speed of 125 words per minute and a standard deviation of 24 words per minute. (Note: Labelled diagrams and proper notation are required for all parts.) a) Draw a normal curve showing the values ???? ± ????, ???? ± 2????, ???? ± 3???? for this distribution on the curve. Use the Empirical Rule to find the approximate probability that a sixth-grade student reads more than 101 words per minute. b) What percentage of sixth-graders read more than 140 words per minute? c) What percentage of sixth-graders read between 110 and 130 words per minute? d) In a random sample of 200 sixth-graders, how many would you expect to read less than 110 words per minute? e) What is the reading speed for a sixth-grader who can read faster than 90% of all sixth-graders? f) A school psychologist wants to determine unusually fast reading rates and unusually slow reading rates. Determine the reading rates of the middle 95% of all sixth-graders. What are the cutoff points for unusual readers?

Asked By Alison On 11/28/2019 21:16