THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING:
The following table displays the joint probability distribution of two discrete random variables X and Y. 
-Determine the marginal probability distribution for X.
Definitions:
Grade Distribution
The statistical spread or pattern of grades received by students in a course or examination.
Significance Level
The probability threshold below which the null hypothesis is rejected in a statistical test, indicating the results are statistically significant.
Chi-squared Goodness-of-fit Test
A statistical test to determine if observed data matches the expected distribution of data across different categories.
Chi-squared Distribution
A statistical distribution describing the distribution of the sum of squared independent, standard normal variables, often used in hypothesis testing.
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