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Alenkasestr [34]
3 years ago
7

Simplify -3-20 divided by (-2*1) Is the answer 7?

Mathematics
1 answer:
Anna35 [415]3 years ago
8 0
No the answer is -13. Please mark me brainliest!
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The math class has a set of 40 calculators, and 85% of the calculators have working batteries. How many calculators need new bat
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6

Step-by-step explanation:

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What are the steps used to transform the general form of the equation of a circle to standard form
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An art history professor assigns letter grades on a test according to the following scheme.A: Top 5% of scoresB: Scores below th
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Answer:

Grade B score:

76 \leq x \leq 89    

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 73.3

Standard Deviation, σ = 9.7

We are given that the distribution of score on test is a bell shaped distribution that is a normal distribution.

Formula:

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

B: Scores below the top 5% and above the bottom 62%

We have to find the value of x such that the probability is 0.62

P( X > x) = P( z > \displaystyle\frac{x - 73.3}{9.7})=0.62  

= 1 -P( z \leq \displaystyle\frac{x - 73.3}{9.7})=0.62  

=P( z \leq \displaystyle\frac{x - 73.3}{9.7})=0.38  

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\displaystyle\frac{x - 73.3}{9.7} = 0.305\\\\x = 76.26  

We have to find the value of x such that the probability is 0.05

P(X < 0.95) = \\\\P( X < x) = P( z < \displaystyle\frac{x - 73.3}{9.7})=0.95

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\displaystyle\frac{x - 73.3}{9.7} = 1.645\\\\x = 89.26  

Thus, the numerical value of score to achieve grade B is

76 \leq x \leq 89

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