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Ksenya-84 [330]
3 years ago
13

I really need help on this, I'm stuck

Mathematics
1 answer:
soldi70 [24.7K]3 years ago
5 0
I think your answer should be 70
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SAT scores probability 1​
fredd [130]

Answer:

  a.  81.5%

Step-by-step explanation:

The z-score for 400 is ...

  Z = (X -μ)/σ = (400 -500)/100 = -1

The z-score for 700 is ...

  Z = (700 -500)/100 = 2

The empirical rule tells you that 68% of the distribution is within ±1σ of the mean, and 95% is within ±2σ of the mean. Half of that first number is in the range Z = -1 to 0, and half that second number is in the range Z = 0 to +2. So, the probability you want is ...

  (1/2)(68%) + (1/2)(95%) = 81.5% . . . . matches choice A

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3 years ago
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Ray Of Light [21]

Answer:its A because i answer this two months ago

Step-by-step explanation:

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2 years ago
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lora16 [44]
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