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3 years ago

PLEASE HELP what does QS equal

Mathematics

2 answers:

Ainat [17]3 years ago

5 0

Answer:

Step-by-step explanation:

QS =2×11 = 22

__________

Stells [14]3 years ago

5 0

Answer:

the answer to your question is 22.

Step-by-step explanation:

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Pamelas age is 3 times Jiris age. The sum of their ages is 96. What is Jiris age?

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Question 15

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10% chance or 1/10

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4 years ago

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I really need help! :'(<br><br> Domain= ?<br><br> Range= ?

hodyreva [135]

Domain = {x|x = 2, 9, 6}
Range = {y|y = c, 0}

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3 years ago

Final exam scores are normally distributed with a mean of 74 and a standard deviation of 6. Approximately, what percentage of fi

notka56 [123]

Answer:

81.86%

Step-by-step explanation:

We have been given that final exam scores are normally distributed with a mean of 74 and a standard deviation of 6.

First of all we will find z-score using z-score formula.

$z=\frac{x-\mu}{\sigma}$

$z=\frac{68-74}{6}$

$z=\frac{-6}{6}=-1$

Now let us find z-score for 86.

$z=\frac{86-74}{6}$

$z=\frac{12}{6}=2$

Now we will find P(-1<Z) which is probability that a random score would be greater than 68. We will find P(2>Z) which is probability that a random score would be less than 86.

Using normal distribution table we will get,

$P(-1$

$P(2>Z)=.97725$

We will use formula $P(a$ to find the probability to find that a normal variable lies between two values.

Upon substituting our given values in above formula we will get,

$P(-1$

Upon converting 0.81859 to percentage we will get

$0.81859*100=81.859\approx 81.86$

Therefore, 81.86% of final exam score will be between 68 and 86.

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3 years ago