To answer the first problem, we determine first the equivalent z score and get the corresponding probability. The z score at 3 hours is (3-3.4)/0.5 = 0.8 while that of 4 hrs is <span>(4-3.4)/0.5 = 1.2. z score of 0.8 is equal to a probability of 0.2119 and that at 1.2 is 0.8849. The difference is 0.673. Hence answer is C.
For problem 2, the z score at 99% is 2.33 hence, the equation becomes 2.33 = (x-30)/6 where x is the noise level threshold. Answer is D. 43.96 decibels.</span>
AnswerD. 64
Step-by-step explanation:
Why is there need to give out the answer? You know it's correct, so don't share answers without explanations.
Answer:
C
Step-by-step explanation:
The sum of the 3 angles in a triangle = 180°
The angle between the tangent and AC is right, that is 90°, thus
x = 180° - (90 + 22)° = 180° - 112° = 68° → C
Group the like terms to get 5m+6w+33.