Question

**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 from the city results in a mean reading rate of more than 94 words per minute?

The probability is ___ (Round to four decimal places as needed.)

(c) What is the probability that a random sample of 26 second grade students from the city results in a mean reading rate of more than 94 words per minute?

The probability is ___ (Round to four decimal places as needed.)

(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 18 second grade students was 91.4 wpm. What might you conclude based on this result?

(Type integers or decimals rounded to four decimal places as needed.)

A. A mean reading rate of 91.4 wpm is unusual since the probability of obtaining a result of 91.4 wpm or more is ___ This means that we would expect a mean reading rate of 91.4 or higher from a population whose mean reading rate is 89 in ____ of every 100 random samples of size n = 18 students. The new program is abundantly more effective than the old program.

B. A mean reading rate of 91.4 wpm is not unusual since the probability of obtaining a result of 91.4 wpm or more is ____ . This means that we would expect a mean reading rate of 91.4 or higher from a population whose mean reading rate is 89 in ____ of every 100 random samples of size n= 18 students. The new program is not abundantly more effective than the old program.

(f) There is a 5% chance that the mean reading speed of a random sample of 21 second grade students will exceed what value? There is a 5% chance that the mean reading speed of a random sample of ____ second grade students will exceed nothing wpm.

(Round to two decimal places as needed.)

Answer #1

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)

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...

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!!

The reading speed of second graders is approximately normal,
with a mean of 90 words per minute and a standard deviation of 10
words per minute.
a) Find the probability a random sample of 25 students would have a
mean reading speed of more than 95 words per minute?
b) Find the probability a random sample of 25 students would have a
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Studies have shown that for all second grade students the
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a) Define a random variable to be used in the problem. State the
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Given a mean if 92 words per minute and a standard
deviation of 10 wpm
There is a 5% chance that the mean reading speed of
a
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Students who have completed a speed reading course have reading
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0.22
0.64
0.36
0.78

The reading speed of sixth-graders is normally distributed with
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Round to two decimal places

A survey was to be conducted in a large city concerning the
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sample of students was to be obtained and a standardized test of
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Since there were many grade 5...

In the sixth grade of a school there are 35 students. The school
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20 children
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