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3 years ago

7

A school directer must randomly select 6 teachers out of 30 in how many ways can the teachers be selected if the order doesn't m

atter

2 answers:

Allushta [10]3 years ago

7 0

It will be 1,344,904

son4ous [18]3 years ago

4 0

230230
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Peter ran 15 miles without stopping during the marathon. Anne ran the distance that Peter ran before she stopped. How far did

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The Answer Should be C

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3 years ago

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.

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

$= 1 -P( z \leq \displaystyle\frac{x - 73}{11})=0.0793$

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

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

$P(z \leq 1.410) = 0.9207$

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

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

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2 years ago

Tuan is playing a game, but the spinner is incomplete. If the numbers in the sections of the spinner represent the probabilities

ioda

The sum of the numbers should total to 1. Let us say that x is the missing number, therefore:

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x = 1 – ¼ - ¼ - 1/5

The numbers should have similar denominator:

x = 20/20 – 5/20 – 5/20 – 4/20

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3 years ago

Have 15 minutes please help!!

Marina86 [1]

Anything which have their degree as 0 is always equal to 1
=> 5^0=1
Option 3 is the answer..!!
Hope this helps you!!

Good Luck!

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2 years ago

I dont understand the elimanation method can someone explain?

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The best way I can explain the elimination method is, it's a method where you either add or subtract equations in order to get rid of a variable.

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3 years ago

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