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3 years ago

12

A survey in 2012 of U.S. households showed that 60% had a traditional landline

1 answer:

Vikentia [17]3 years ago

4 0

Answer:

0.51

Step-by-step explanation:

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Rate this app 1/10 and explain why

Pie

I don’t really like it. It caused me to not like math as much. 2/10

5 0

3 years ago

Read 2 more answers

Solve the inequality.<br><br><br> 6(b – 4) > 30

a_sh-v [17]

It would go like this 6(b-4)>30 would then be 6b-24>30 then you would have to add 24 to both the -24 and the 30 to get 6b>54 the you would have to divide 54 by 6 and after that your answer would be b> 9

4 0

3 years ago

Read 2 more answers

in a certain population, 11% of people are left-handed. Suppose that you plan to randomly select 100 people and ask each person

Assoli18 [71]

Answer:

c. A and C

Step-by-step explanation:

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".

Let X the random variable of interest, on this case we now that:

$X \sim Binom(n=100, p=0.11)$

The probability mass function for the Binomial distribution is given as:

$P(X)=(nCx)(p)^x (1-p)^{n-x}$

Where (nCx) means combinatory and it's given by this formula:

$nCx=\frac{n!}{(n-x)! x!}$

We need to check the conditions in order to use the normal approximation.

$np=100*0.11=11 > 10 \geq 10$

$n(1-p)=100*(1-0.11)=99 \geq 10$

So we see that we satisfy the conditions and then we can apply the approximation.

If we appply the approximation the new mean and standard deviation are:

$E(X)=np=100*0.11=11$

$\sigma=\sqrt{np(1-p)}=\sqrt{100*0.11(1-0.11)}=3.129$

Part A

We want this probability:

$P(X \geq 12) = 1-P(X$

The z score is defined as

$Z=\frac{x-\mu}{\sigma}$ .

$P(X \geq 12) = 1-P(X$

Part B

P(X>12) = 1-P(X\leq 12) = 1-P(Z< \frac{12-11}{3.129})=1-0.625=0.375[/tex]

Part C

$P(10\leq X \leq 14) = P(X$

The z score is defined as

$Z=\frac{x-\mu}{\sigma}$ .

$P(10 \leq X \leq 14) =P(Z< \frac{14-11}{3.129}) -P(Z< \frac{10-11}{3.129})=P(Z$

So then the best option is : c. A and C

8 0

4 years ago

The perimeter of a rectangle is 70cm.

Pavlova-9 [17]

Answer:

11 ALSO SOMEONE PLS ANSWER MY QUESTION

Step-by-step explanation:

24+24=48

70-48=22

22/2=11

4 0

3 years ago

Round 1.3185 to 2 significant figures

zmey [24]

It would be 1.3 bescuse its only 2 significant figures

7 0

3 years ago