What is m<4? Pls help me

(40 points) i need some . an answer definition is appreciated as well.

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics