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A tablet has a 7.5- × 5.8-inch screen size with a resolution of 326 pixels per...

A tablet has a 7.5- × 5.8-inch screen size with a resolution of 326 pixels per inch. (a) How many pixels does it have? (b) With 256 levels of brightness for each color subpixel, what is the MiB size of the display memory

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Answer #1 
a)
total number of pixels = (7.5*326)*(5.8*326) = ‭46,23,006‬
Answer: 4623006‬

b)
for 256 levels, it takes log(256) = 8 bits, which is 1 byte
there are 3 colors(red, green, blue).
so, total size for one pixel is 3 bytes
total amount of memory = 4623006‬*3 = ‭13869018‬ bytes.
= ‭13869018‬ / 1024 KB
= ‭13543.962890625‬ KB
= 13543.962890625‬/1024 KB
= ‭13.2265262603759765625‬ MB
Answer: 13.23 MB
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