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ELEN [110]
3 years ago
11

Please help with 19 and 20 and explain

Mathematics
2 answers:
Verizon [17]3 years ago
4 0
It should be 15 and 8.6
Talja [164]3 years ago
3 0
The answer is 15 and 8.6
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Answer:

C

Step-by-step explanation:

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3 years ago
The national average sat score (for verbal and math) is 1028. if we assume a normal distribution with standard deviation 92, wha
elena55 [62]

Let X be the national sat score. X follows normal distribution with mean μ =1028, standard deviation σ = 92

The 90th percentile score is nothing but the x value for which area below x is 90%.

To find 90th percentile we will find find z score such that probability below z is 0.9

P(Z <z) = 0.9

Using excel function to find z score corresponding to probability 0.9 is

z = NORM.S.INV(0.9) = 1.28

z =1.28

Now convert z score into x value using the formula

x = z *σ + μ

x = 1.28 * 92 + 1028

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The probability that randomly selected score exceeds 1200 is

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Z score corresponding to x=1200 is

z = \frac{x - mean}{standard deviation}

z = \frac{1200-1028}{92}

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P(Z > 1.87 ) = 1 - P(Z < 1.87)

Using z-score table to find probability z < 1.87

P(Z < 1.87) = 0.9693

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3 years ago
In a recent survey, two-thirds of the 234 students in a freshman class said they watch television shows on their computer. Deter
stellarik [79]
We know that 2/3 of all students watch TV shows on their computers.
And 234 students were in that survey.
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8 units left and 5 units up
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