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3 years ago

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Which events are independent?

2 answers:

Vinvika [58]3 years ago

5 0

If you are picking marbles/cards from a bag/deck without replacing them, these would be dependent events because one pick would affect the probability of getting the other components in the bag/deck. If you pick a marble from a bag and then put that marble back in the bag, then it would be an independent because the probabilities are staying consistent.

So, the second and fourth options would be independent events.

lianna [129]3 years ago

3 0

Answer:

B and D

Step-by-step explanation:

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Julia spends $2.25 on gas for her lawn mower. She earns $15.00 mowing her neighbors lawn. What is Julia’s profit?

Korolek [52]

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4 years ago

In a normally distributed data set a mean of 55 where 99.7% of the data fall between 47.5 and 62.5, what would be the standard d

NeX [460]

Given that normally distributed data set has a mean of 55 and 99.7% of data fall between 47.5 and 62.5.

Let s be the standard deviation of data set.

Since 99.7% data fall within 3 standard deviations of mean, z-value for 47.5 and 62.5 has an absolute value of 3.

That is |z|=3

But z= $\frac{x-mean}{standard deviation}$

Let us plugin x=47.5 and mean =55 and equate it to 3.

That is $|\frac{47.5-55}{s}| = 3$

$|\frac{-7.5}{s} | =3$

Since x is always positive ( being standard deviation), $|\frac{-7.5}{s} | = \frac{|-7.5|}{s} = \frac{7.5}{s}$

Hence $\frac{7.5}{s}= 3$

$s=\frac{7.5}{3} = 2.5$

We will get same value with 62.5 as well.

Hence standard deviation of data set is 2.5.

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4 years ago

Please help me Asap thanks if you do!

andrezito [222]

Answer:

(A) 9

Step-by-step explanation:

Substitute 2 for X

$7-(-2)=9$

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