The quotient of a number and -7 is less than 13

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

Which of the following vectors are orthogonal to (2,1)? check all that apply

Use a standard normal table to determine the probability. give your answer as a decimal to four decimal places. −1.5< < 1.5)