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3 years ago

Mrs. Wilbur can grade a set of 30 test in 2 hours. What is Miss wilbur rate per hour?

Mathematics

2 answers:

shusha [124]3 years ago

8 0

Answer: 15 tests per hour

otez555 [7]3 years ago

5 0

Answer: 15 tests per hour.

Step-by-step explanation: Mrs. Wilbur did 30 tests in 2 hours, so you would divide to find the rate per hour. 15 should be your answer.

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m_a_m_a [10]

Answer:

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Step-by-step explanation:

4x - 1 = -13

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A professor at a local university noted that the exam grades of her students were normally distributed with a mean of 73 and a s

Umnica [9.8K]

Answer:

88.51 is the minimum score needed to receive a grade of A.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 73

Standard Deviation, σ = 11

We are given that the distribution of exam grades is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

We have to find the value of x such that the probability is 0.0793.

$P( X \geq x) = P( z \geq \displaystyle\frac{x - 73}{11})=0.0793$

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$=P( z \leq \displaystyle\frac{x - 73}{11})=0.9207$

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$P(z \leq 1.410) = 0.9207$

$\displaystyle\frac{x - 73}{11} = 1.410\\x =88.51$

Hence, 88.51 is the minimum score needed to receive a grade of A.

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3 years ago

Graph the solution of the inequality on a number line. x − (5 − 3x) ≤ 2x − 1

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Answer:

x ≤ 2

Step-by-step explanation:

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The graph includes all point to the left from point 2, same point included

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