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Fynjy0 [20]
3 years ago
10

What us the estimate 30-20.91

Mathematics
2 answers:
zimovet [89]3 years ago
8 0
9.09 I'm pretty sure this it 
aleksandr82 [10.1K]3 years ago
7 0
The estimate for 30-20.91 is 9.09 or 9.1

Hope I helped :)

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Answer:

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borishaifa [10]

675 people will have score between 85 and 120

Step-by-step explanation:

Given

Mean = 100

SD = 15

If we have to find percentage of score between two values we have to find the z-score for both values and then area under the curve for both values

z-score is given by:

for a value x:

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So,

For 85:

z-score = z_1 = \frac{85-mean}{SD}\\ = \frac{85-100}{15}\\=\frac{-15}{15}\\=-1

z-score = z_2 = \frac{120-mean}{SD}\\ = \frac{120-100}{15}\\=\frac{20}{15}\\=1.3333

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For z2: 0.9082

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So the probability of score between 85 and 120 is 0.7495

As the sample is of 900 people, the people with scores between 85 and 120 will be:

900*0.7495 = 674.55 people

Rounding off to nearest whole number

675 people will have score between 85 and 120

Keywords: Probability, SD

Learn more about probability at:

  • brainly.com/question/10978510
  • brainly.com/question/11007026

#LearnwithBrainly

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4 years ago
72 is what percent of 60
Julli [10]
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4 years ago
Which of the g-values satisfy the following inequality?
Tema [17]

Answer:

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