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loris [4]
3 years ago
6

SAT scores probability 1​

Mathematics
1 answer:
fredd [130]3 years ago
6 0

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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stiv31 [10]
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3 years ago
An angle measures 120°less than the measure if its supplementary angle. What is the measure of each angle
marissa [1.9K]

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7 0
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If the graph is reflected across the y-axis, what will be the equation of the new graph?
Bumek [7]

Answer:

\displaystyle b)y =  { 3}^{ - x}  + 1

Step-by-step explanation:

we are given a exponential function

\displaystyle y =  {3}^{x}  + 1

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remember that,

\rm\displaystyle (x,y) \xrightarrow{ \text{ reflection  over  y - axis}}( - x,y)

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5 0
3 years ago
Read 2 more answers
Can someone please help me with my math homework
Natali5045456 [20]
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time = distance/spped
time = distance/60
time=62.78/60
time=1.05 (1 hour 5 mins)

Marcus travels 78000(2)(square) +32500(2)
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a)Josephine arrives first
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6 0
3 years ago
The dot plot represents the prices of different brands of chocolate bars.
puteri [66]

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4 0
3 years ago
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