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.
Answer:
4x-2y=-12
Step-by-step explanation:
Answer:
Step-by-step explanation:
Alexis earned to equal Eduardo earned in how many weeks
Alexis earned 115 + 50w = Total w equals weeks
Eduardo earned 130 + 40w = Total w equals weeks
subtract equations -15 + 10w = 0
10w = 15
w = 1.5 weeks they both will have $190
I didn’t learn this yet but maybe
