This can be solved using the formula for t test which is = x - mu over standard deviation divided by the square root of the number of samples. In this case, it is 1185 - 1200 over 70 divided by square root of 100 which give us a value of 2.14 which is equal to .9839 in area. Only rarely, just over one time in a hundred tries of 100 light bulbs, would the average life exceed 1200 hours.
Perimeter is all the sides added up so 20+20+10=50 the 50+10=60 so 10 is your answer
Answer:
Hard
Step-by-step explanation:
22 hours * 60 minutes = 1320 minutes.
The answer is x = -5, it looks like you got it right.
