I was wondering if I can get help with this please and thank you ( take your time :) ) Also for number two can you put the answer the way it says in the question please and thank you

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1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?