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ohaa [14]
3 years ago
13

Help help help help help

Mathematics
2 answers:
ryzh [129]3 years ago
7 0
The last one................
Vladimir [108]3 years ago
4 0

Answer:

D.

Step-by-step explanation:

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At a bike shop, Kirby is buying a new bike that costs
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Answer:

tax: $18.9

total cost: $333.9

Step-by-step explanation:

$315 × 0.06 = 18.9

18.9 + 315 = 333.9

btw you can also do "315 × 1.06" to get the total cost without having to manually add the tax

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A store normally sells a floor lamp for $83.99. The store is having a sale that reduces the lamp's price by 15%. How much does t
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12% of children are nearsighted, but this condition often is not detected until they go to kindergarten. A school district tests
Klio2033 [76]

Answer:

There is a 34.60% probability that 0 or 1 of them is nearsighted.

Step-by-step explanation:

For each children, there are only two possible outcomes. Either they are nearsighted, or they are not. This means that we can solve this problem using the binomial probability distribution.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinatios of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

In this problem, we have that:

12% of children are nearsighted. This means that p = 0.12.

A school district tests all incoming kindergarteners' vision. In a class of 18 kindergarten students, what is the probability that 0 or 1 of them is nearsighted?

There are 18 students, so n = 18

This probability is:

P = P(X = 0) + P(X = 1)

So

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 0) = C_{18,0}.(0.12)^{0}.(0.88)^{18} = 0.1002

P(X = 1) = C_{18,1}.(0.12)^{1}.(0.88)^{17} = 0.2458

So

P = P(X = 0) + P(X = 1) = 0.1002 + 0.2458 = 0.3460

There is a 34.60% probability that 0 or 1 of them is nearsighted.

5 0
3 years ago
⚠️⚠️⚠️⚠️help⚠️⚠️⚠️⚠️​
Zigmanuir [339]
I say it’s 2/3 I mean that line means it’s a negative but there’s no negative 2 attached to the line
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Evaluate each expression<br> 7 + 9=<br> 43 - 5=
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The answer you just add and subtract
7+9=16
43-5=38
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2 years ago
Read 2 more answers
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