H[8/15, 2:46 PM] Destiny: 6. The following table shows scores obtained in an examination by B.Ed JHS Specialism students. Use the information to answer the questions that follow: Score 20-24 25-29 30-34 35-39 40-44 45-49 50-54 55-59 60-64 65-69 Frequency 10 4 10 20 30 15 3 2 1 5 a. Construct a cumulative frequency curve for the data. b. Find the; i. inter-quartile range. ii. 70th percentile class scores. iii. probability that a student scored at most 50 on the examination
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.
H[8/15, 2:46 PM] Destiny: 6. The following table shows scores obtained in an examination by B.Ed
JHS Specialism students. Use the information to answer the questions
that follow:
Score 20-24 25-29 30-34 35-39 40-44 45-49 50-54 55-59 60-64 65-69
Frequency 10 4 10 20 30 15 3 2 1 5
a. Construct a cumulative frequency curve for the data.
b. Find the;
i. inter-
ii. 70th percentile class scores.
iii. probability that a student scored at most 50 on the examination
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