$\%$ Practice Exercise $8\mathrm{.}1\mathrm{.}7$ and $8$

$\%$ Consider the following array

x$=[110426$

$587823$

$5645913$

$232289]$;

$\%8\mathrm{.}1\mathrm{.}7$ a$)$ Using single index notation, use the find function to find the index numbers

$\%$ of the elements in the array that contain values between $10$ and $40$ or between $70$ and $80.$

$\%$ Call your result index.

index $=$ find$(($x $>=10$ & x $<=40)|($x $>=70$ & x $<=80))$;

index $=$ index$(1$:min$(5,$ numel$($index$)))$;

$\%$ b$)$ Report the values in the array that are between $10$ and $40$ or between $70$ and $80.$

$\%$ Call your answer values.

values $=$ x$($index$)$;

disp$(\text{'}$Values:$\text{'})$;

disp$($values$)$;

$\%8\mathrm{.}1\mathrm{.}8$ Use the length function and your results from part a or b to determine how many values in the array

$\%$ meet the criteria from this problem. Name your result total

total $=$ length$($values$)$;

disp$(\text{'}$Total:$\text{'})$;

disp$($total$)$;