Tema
Q:
What percent of the population has an intelligence quotient below 100?A. 75% B. 50% C. 35% D. 10%
Q:
Assume the random variable X is normally distributed, with mean \( \mu=48 \) and standard deviation \( \sigma=8 \). Find the 12 th percentle
The 12 th percentile is
(Round to two decimal places as needed.)
Q:
Question 21
SEAGULLS A biologist studying seagulls estimates that \( 5 \% \) of the seagulls in a flock have been banded. If 22 of the seagulls have been
banded, approximately how many seagulls are in the flock?
\( \begin{array}{ll}\text { A) } 110 \\ \text { B) } 440 \\ \text { C) } 1100 \\ \text { D) } 4400\end{array} \)
Q:
Find the value of \( z_{a} \)
The value of \( z_{0.32} \) is \( \square \). (Round to two decimal places as needed.)
Q:
\( 16 \quad \) Find the value of \( z_{\alpha} \)
\( z_{0.41} \)
\( z_{0.41}=\square \) (Round to two decimal places as needed.)
Q:
Find the z-scores that separate the middle \( 80 \% \) of the distribution from the area in the tails of the standard normal distribution.
The z-scores are ture a comma to separate answers as needed. Round to two decimal places as needed.)
(Use a
Q:
Find the z-scores that separate the middle \( 80 \% \) of the distribution from the area in the tails of the standard normal distribution.
The z-scores are
(Use a comma to separate answers as needed. Round to two decimal places as needed.)
Q:
Find the z-score such that the area under the standard normal curve to the right is 0.22 .
The approximate \( z \)-score that corresponds to a right tail area of 0.22 is
(Round to two decimal places as needed.)
Q:
16. Find the 2 -score such that the area under the standard nomal curve to the left is 0.86 .
\( \square \) is the Z-score such that the area under the curve to the left 50.86 .
(Round to two decimal places as needed.)
Q:
Determine the area under the standard normal curve that lies between \( (a) \mathrm{Z}=-0.81 \) and \( \mathrm{Z}=0.81 \), (b) \( \mathrm{Z}=-2.73 \) and \( \mathrm{Z}=0 \), and (c) \( \mathrm{Z}=-0.48 \) and \( \mathrm{Z}=0.57 \).
(a) The area that lies between \( \mathrm{Z}=-0.81 \) and \( \mathrm{Z}=0.81 \) is
(Round to four decimal places as needed.)
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