Search & Filtering
3. A psychologist feels that plaing soft music during a test will change the results of the test. The psychologist is not sure wether the grades will be higher or lower. In the past, the mean of the scores was 73.
Given a normal distribution with μ = 180 and σ = 20, find
a. The area above 230
b. The area below 215
c. The area between 185 and 225
Listed are the weights of the NBA’s top 50 players.
240
210
220
260
250
195
230
270
325
225
165
295
205
230
250
210
220
210
230
202
250
265
230
210
240
245
225
180
175
215
215
235
245
250
215
210
195
240
225
260
210
190
260
230
190
210
230
185
260
240
Required:
d) Construct a grouped frequency distribution with 8 classes.
e) Also write down cumulative frequency distribution for the given data
f) Construct a histogram, Frequency Polygon and Ogive for the data.
jester estimate that the probability that he will pass statistics and probability is 65%; the probability that he will pass basic calculus is 52%; and the probability of passing both subjects is 45%. find the probability that he will pass at least one of these two subjects
the mean score of random sample of 22 student applicants who took the college entrance examination is calculated to be 76.9 the population standard deviation is known to be 27.4 find the 99% confidence interval for the mean of the entire student applicants (hint: ESTIMATION OF PARAMETERS)
Suppose a box contains 20 red marbles, 12 blue
marbles, 8 green marbles, and 10 yellow marbles. If
you randomly select one marble from the box.
(a) what is the probability that you will have a red
marble?
(b) what is the probability that you will have a green
marble?
(c) what is the probability that you will have a red or
green marble?
(d) what is the probability that you will have a red and
yellow marble?
(e) what is the probability that you will have a red
marble with replacement?
(f) what is the probability that you will have a blue
marble without replacement?
(g) what is the probability that you will have a yellow
marble with replacement?
(h) what is the probability that you will have a green
marble with replacement?
Suppose a box contains 20 red marbles, 12 blue
marbles, 8 green marbles, and 10 yellow marbles. If
you randomly select one marble from the box.
(a) what is the probability that you will have a red
marble?
(b) what is the probability that you will have a green
marble?
(c) what is the probability that you will have a red or
green marble?
(d) what is the probability that you will have a red and
yellow marble?
(e) what is the probability that you will have a red
marble with replacement?
(f) what is the probability that you will have a blue
marble without replacement?
(g) what is the probability that you will have a yellow
marble with replacement?
(h) what is the probability that you will have a green
marble with replacement?
If you randomly select a card from a well-shuffled standard deck of 52 cards, the probability that the card you select is a 5 is
The ages of a certain group of students in a junior high school follow a normal
distribution with a mean of 13 and a standard deviation of 1.5. Find the probability
that a randomly selected student is between 10-16 years old.
The ages of a certain group of students in a junior high school follow a normal
distribution with a mean of 13 and a standard deviation of 1.5. Find the probability
that a randomly selected student is between 10-16 years old.
