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anzhelika [568]
3 years ago
12

A survey of high school juniors found that 82% of students plan on attending college. If you pick three at random, what is the p

robability that at least two plan on attending college? Round to the nearest percent.
I answered the question incorrectly, thinking it was 36% but the correct answer was 91%. Can someone please tell me what I did wrong and what is the rule or process I need to take. The book never showed me any other way to solve this just this: P(x) = nCx P^x q^n-x, I just want to learn the right way to avoid mistakes again for the upcoming test.
Please and thank you
Mathematics
1 answer:
Andrew [12]3 years ago
6 0

Answer:

91%

You forgot to add 'all three'

Step-by-step explanation:

X ~ B(3, 0.82)

q = 1 - 0.82 = 0.18

Atleast 2 means:

X = 2, or 3

3C2(0.82)²(0.18) + 3C3(0.82)³(0.18)⁰

= 0.363096 + 0.551368

= 0.914464

= 91.4464%

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Add. Write your answer in scientific notation. (8×106)+(7.92×109)
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The sum of the numbers 8 × 10⁶ and 7.92 × 10⁹ in the form of scientific notation will be 7.928 × 10⁹.

<h3>What is Algebra?</h3>

The analysis of mathematical representations is algebra, and the handling of those symbols is logic.

The expression is given below.

8 × 10⁶ and 7.92 × 10⁹

The addition of both terms 8 × 10⁶ and 7.92 × 10⁹ will be

⇒ 8 × 10⁶ + 7.92 × 10⁹

⇒ 8 × 10⁶ + 7920 × 10⁶

⇒ 7928 × 10⁶

⇒ 7.928 × 10⁹

The sum of the numbers 8 × 10⁶ and 7.92 × 10⁹ in the form of scientific notation will be 7.928 × 10⁹.

More about the Algebra link is given below.

brainly.com/question/953809

#SPJ1

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