The time it takes for a statistics professor to mark a single midterm test is normally distributed with a mean of 4.8 minutes an
1 answer:
Answer:
Step-by-step explanation:
SD of mean = 2.3/ = 0.418
5 hours = 300 minutes
300 minutes/55 students = 5.45 min/student
The problem asks what is the probability he needs more than an average of 5 min/student
P(XBAR < 5.0) = P((XBAR - 4.8) / 0.418) < (5.0 - 4.8) /0.418) = P(Z < 0.478) = 0.8893
P(XBAR > 5.0) = 1 - 0.8893 = 0.1107
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Answer:
<u>x=-1.5</u>
Step-by-step explanation:
To solve for x, you need to rearrange so the x is on one side of the "=" by itself.
So To do that, first you need to subtract 1/4 on both sides of the "=". This leaves you with 1/2+x=-3/4-1/4. You can simplify the -3/4-1/4 to -1 (-4/4). So, you now have 1/2+x=-1.
The next step is to subtract 1/2 on both sides of the "=". This leaves you with x=-1-1/2. Again, you can simplify the -1-1/2 to -3/2 which can be written as -1.5. So, you now have x=-1.5, which is the final answer.
The question may ask you to write your answer in the form of a fraction, in which case your answer x=-3/2. If the questions wants it written as a mixed number, your answer would be -1 1/2.
<em>I have attached a photograph of this method written out using the funnel technique. </em>
The answer is true. Hope this helps. Mark brainest
