Question
In the sixth grade of a school there are 35 students. The school principal considers that...
In the sixth grade of a school there are 35 students. The school principal considers that the reading speed of the students has approximately a normal distribution, with an average speed of 125 words per minute and a standard deviation of 24 words per minute.
a. How many sixth graders will have a reading speed greater than 130 words per minute?
20 children
17 children
15 children
18 children
b. A child is selected at random. What is the probability that your reading speed is between 120 and 130 words per minute?
0.4168
0.1664
0.5832
0.1824
c. What must be the minimum reading speed for a sixth grader to be in the top 10% (90th percentile) of the class?
156 words per minute
150 words per minute
160 words per minute
159 words per minute
Homework Answers
Answer #1
Not the answer you're looking for?
Similar Questions
the reading soeed of a sixth-grade student is appoximately normal, with a mean of 125 words...
the
reading soeed of a sixth-grade student is appoximately normal, with
a mean of 125 words per minute and a standard deviation of 24 words
per minute. of 1000 randomly select sixth-grade students about how
many students reads between 110 and 130 words per minutes?
The reading speed of sixth-graders is normally distributed with a mean speed of 125 words per...
The reading speed of sixth-graders is normally distributed with
a mean speed of 125 words per minute and a standard deviation of 24
wpm. A school psychologist wants to determine reading rates for
unusual students (slow and fast). Determine the reading rates of
the middle 90% of all sixth-graders. What are the cutoff points for
unusual readers? [a] and [b]
Round to two decimal places
1-4. The reading speed of second-grade students is approximately normal, with a mean of 90 words...
1-4. The reading speed of second-grade students
is approximately normal, with a mean of 90 words per minute (wpm)
and a standard deviation of 12 wpm.
1. What is the z-score for a
second-grade student who reads 100 wpm?
2. What is the probability a randomly
selected second-grade student will read more than 100 wpm?
3. What is the reading speed of a
second grader whose reading speed is at the 90th percentile?
Please Show all work!!
Studies have shown that for all second grade students the average reading speed is 90 words...
Studies have shown that for all second grade students the
average reading speed is 90 words per minute with a standard
deviation of 10 words per minute. You take a sample of 34 second
graders and compute their average reading speed. What is the
probability that the average reading speed is between 95 and 100
words per minute?
a) Define a random variable to be used in the problem. State the
distribution of this variable, perform all necessary checks, and...
1. The reading speed of second grade students is approximately normal with a mean of 90...
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...
Suppose the national reading level for high school students 120 words per minute with a standard...
Suppose the national reading level for high school students 120
words per minute with a standard deviation of 14. A local high
school wants to know their students read at a level different from
the national average. The level of the test is set at 20. A random
sample size of 122 students has been drawn and the resulting
average is 130 words per minute. Provide the critical value, test
statistia and the number of this hypothesis test has. Show...
The reading speed of second grade students in a large city is approximately normal, with a...
The
reading speed of second grade students in a large city is
approximately normal, with a mean of 88 words per minute (wpm) and
a standard deviation of 10 wpm.
What is the probability that a random sample of 10 second
grade students from the city results in a mean reading rate of more
than 94 words per minute?
(Round to four decimal places as needed)
The reading speed of second grade students in a large city is approximately normal, with a...
The reading speed of second grade students in a large
city is approximately normal, with a mean of 89 words per minute
(wpm) and 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 94 words per minute?
The probability is ___ (Round to four decimal places as
needed.)
(b) What is the probability that a random sample of 13 second
grade students...
Suppose the national reading level for high school students is 140 words per minute with a...
Suppose the national reading level for high school students is
140 words per minute with a standard deviation of 12. A local high
school wants to know if their students read at a level different
from the national average. The level of the test is set at .20. A
random sample size of 125 students has been drawn and the resulting
average is 132 words per minute. Provide the critical value, the
test statistic and the number of tails this...
Suppose that you are an elementary school teacher and you are evaluating the reading levels of...
Suppose that you are an elementary school teacher and you are
evaluating the reading levels of your students. You find an
individual that reads 64.1 word per minute. You do some research
and determine that the reading rates for their grade level are
normally distributed with a mean of 100 words per minute and a
standard deviation of 21 words per minute.
a. At what percentile is the child's reading level (round final
answer to one decimal place).
b. Create...
ADVERTISEMENT
Need Online Homework Help?
Get Answers For Free
Most questions answered within 1 hours.
ADVERTISEMENT
Active Questions
asked 10 minutes ago
asked 41 minutes ago
asked 54 minutes ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 2 hours ago
asked 2 hours ago
asked 2 hours ago
asked 2 hours ago
asked 2 hours ago