Problem $1$: $(20$ points$)$

You are to analyze the COVID$-19$ data in the United States in this problem. The data is

included in the text file US$\_$COVID$19.$txt$.$ Read the header lines in the file for information

about the data. Bring the data into MATLAB and perform the following exercises.

$($a$)$ How many positive cases are there on July $4^{th}(20200704)?$ Put the answer in p$1$a$.$

$($b$)$ How many positive cases are there on Thanksgiving $(20201126)?$ Put the answer in

p$1$b$.$

$($c$)$ Create figure $1$ to plot the number of positive cases. Put the year day in the

horizontal axis and the number of positive cases on the vertical axis. The figure must

include the following items:

A bar plot showing the number of positive COVID$-19$ cases.

Cyan filled diamond markers to indicate the year day and the number of positive cases

on July $4^{th}.$

Magenta filled circle markers to indicate the year day and the number of positive cases

on Thanksgiving.

A red solid line showing the $15-$day running average.

The figure must include axis labels, legend and title. Set p$1$c $=$ 'See figure $1\text{'}.$

Hint: The $15-$day running average on a specific date is the average of the positive cases

occurring during the preceding $7$ days, the following $7$ days, and on that date. Set the $15-$day running average to be NaN for the first $7$ days and the last $7$ days of the record