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Kipish [7]
3 years ago
13

How can I solve this problem

Mathematics
1 answer:
Rzqust [24]3 years ago
3 0
What a terrible question. I'm sorry you have this teacher. I think the answer they are looking for is 42 even though there's that +/- should be in a parenthesis and then you are rounding 6.5² to 42. Hope this helps
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I think the answer is C
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3 years ago
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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

x = 1145.76

The 90th percentile score value is 1145.76

The probability that randomly selected score exceeds 1200 is

P(X > 1200)

Z score corresponding to x=1200 is

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

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

z = 1.8695 ~ 1.87

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

P(Z > 1.87) = 1 - 0.9693

P(Z > 1.87) = 0.0307

The probability that a randomly selected score exceeds 1200 is 0.0307

5 0
3 years ago
The hotdog eating champion, ate 13 hot dogs every 2 minutes at the county fair contest. How long did it take him to eat 91 hot d
deff fn [24]

They ate 13 hot dogs in 2 minutes, so divide 13 by 2 to find out how many hot dogs he ate in 1 minute:

13 / 2 = 6.5 hot dogs per minute.

Now divide total hot dogs eaten by 6.5 to get the total time:

91 / 6.5 = 14 total minutes.

5 0
3 years ago
Read 2 more answers
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xxMikexx [17]

Answer:

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4 0
3 years ago
Find the percent change from 72 to 80.
LenaWriter [7]
11.1111 I think this is it
3 0
3 years ago
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