Study Hours Frequency 10 30 8. 20 20 6. 15 10 Above is a frequency distribution of the number of hours students studied for a test. What proportion of students studied for 7 hours or less? a. 35 O b. 40 Oc. 45 O d. 50 O e. 65
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
![Study Hours
Frequency
10
9.
30
8
20
7
20
6.
15
10
Above is a frequency distribution of the number of hours students studied for a test. What
proportion of students studied for 7 hours or less?
a. 35
O b. 40
Oc. 45
d. 50
O e. 65](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa3f39217-6130-4f13-a4f0-d29b129d90ed%2F93467cd2-2fc5-40b5-a03d-9995cfee2e54%2Fjizh6ev_processed.jpeg&w=3840&q=75)
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