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Illusion [34]
3 years ago
8

Assume that when adults with smartphones are randomly​ selected, 56​% use them in meetings or classes. If 11 adult smartphone us

ers are randomly​ selected, find the probability that fewer than 3 of them use their smartphones in meetings or classes.
Mathematics
1 answer:
Slav-nsk [51]3 years ago
3 0

Step-by-step explanation:

Use binomial probability:

P = nCr pʳ qⁿ⁻ʳ

where n is the number of trials,

r is the number of successes,

p is the probability of success,

and q is the probability of failure (1−p).

Here, n = 11, p = 0.56, q = 0.44, and r = 0, 1, or 2.

P = ₁₁C₀ (0.56)⁰ (0.44)¹¹ + ₁₁C₁ (0.56)¹ (0.44)¹⁰ + ₁₁C₂ (0.56)² (0.44)⁹

P = (0.44)¹¹ + 11 (0.56) (0.44)¹⁰ + 55 (0.56)² (0.44)⁹

P ≈ 0.0125

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MAXImum [283]

Answer:

1+1 is 2 and 2+3 is 5

Step-by-step explanation:

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3 years ago
Which is the approximate solution for the system of equations 8x - 10y = -23 and 9x + 10y = -16?
GaryK [48]

Answer:

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7 0
3 years ago
The slope of the line that represents the data Nicholas collected is -63, and the y-intercept is 825. Explain what these represe
Taya2010 [7]

Answer:

The slope is -63.  It is how many cans that go away each day.

Step-by-step explanation:

The y intercept is the y value when x =0

It is the number of canned goods we start with.

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The equation can be written in the form

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4 0
4 years ago
Read 2 more answers
Charlene is looking at a pair of earrings that cost $10 find the total cost of the errands if there's a 15% discount in the sale
Aleks04 [339]
So, let's try applying the discount before the sales tax first. Because it's a 15% discount, the earrings will be 85% of their original cost. (100 - 15 = 85). You can turn this percentage into a decimal (0.85) and multiply.

0.85 * 10 = 8.5.

Because we're working with money, this becomes $8.50. But we still need to add the sales tax. 8% can also be expressed as 0.08.

0.08 * 8.50 = 0.68. 

So we add the sales tax, $0.68 to the discounted price of the earrings, $8.50.

$8.50 + $0.68 = $9.18.

Now let's try applying the sales tax first. 0.08 * 10 = 0.8

10 + 0.8 = 10.8. But again, we're working with money so this becomes $10.80. 

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7 0
3 years ago
Find all real numbers $s$ such that $-2(s - 7) > 4s + 8$. Give your answer in interval notation.
Stolb23 [73]

Answer:

s\in (-\infty,1)

Step-by-step explanation:

Solve the inequality -2(s - 7) > 4s + 8

Use distributive property:

-2s+14>4s+8

Subtract 4s:

-2s+14-4s>4s+8-4s\\ \\-6s+14>8

Subtract 14:

-6s+14-14>8-14\\ \\-6s>-6

Divide by -6 (do not forget to change sign, because division by negative number changes the sign):

s

5 0
4 years ago
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