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3 years ago

Solving for a missing base

Mathematics

1 answer:

SOVA2 [1]3 years ago

8 0

Answer: what is your question, is this your question bro

Step-by-step explanation:

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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

adoni [48]

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

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

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

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

Calculation the value from standard normal z table, we have,

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

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

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

Calculation the value from standard normal z table, we have,

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

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

$76 \leq x \leq 89$

7 0

3 years ago

7 ⅓ ÷ 225 = <br> answer this question plz

antoniya [11.8K]

Answer:

0.03259..

Step-by-step explanation:

7 0

3 years ago

13x + 15=17x-13 solve for the solution

Archy [21]

Answer: x=7

Step-by-step explanation:

Step 1: Subtract 17x from both sides.

13x+15−17x=17x−13−17x

−4x+15=−13

Step 2: Subtract 15 from both sides.

−4x+15−15=−13−15

−4x=−28

Step 3: Divide both sides by -4.

−4x/−4 =−28/−4

x=7

6 0

3 years ago

What is the sum of 2x2 + 6x + 5 and 3x2 – 2x – 1?

Kipish [7]

5x2 + 4x + 4

Hope this helps!!!!!

Brainliest plzzzzz

3 0

3 years ago

Please help me with this question

-Dominant- [34]

Answer: alabama is more hotter then hawaii

Step-by-step explanation:

8 0

2 years ago

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