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3 years ago

A TV remote control has keys for channels 0 through 9.

Mathematics

1 answer:

UkoKoshka [18]3 years ago

8 0

Answer:

a) If a key is selected at random, what is the probability that the key for channel 1 is pressed?

1/10

There are 10 channels in total. 9 channels + 0 channel.

b) If a key is selected at random, what is the probability that the key for an even number is pressed?

5/10

0,2, 4, 6, 8 < The even numbers out of 10 channels

c) If a key is selected at random, what is the probability that the key for a number more than 6 is pressed?

3/10

7, 8, 9 are the numbers greater than 6

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A culture of bacteria has an initial population of 72000 bacteria and doubles every 10

telo118 [61]

Answer: 233928.6902 ≈ 233929

Step-by-step explanation:

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2 years ago

Translate the sentence into an equation, then solve the

Oduvanchick [21]

Answer:

The equation is: $\frac{x-7}{5} = 13$ and the number is 72.

Step-by-step explanation:

We have to use mathematical notation to convert the given statement into an equation. As we don't know the exact value of number, we have to use a variable in place of the number.

Let x be the required number then

"A number decreased by 7"

$x-7$

"and then divided by 5"

$\frac{x-7}{5}$

" is 13."

$\frac{x-7}{5} = 13$

For solving, multiplying both sides of equation by "5"

$\frac{x-7}{5} * 5 = 13*5\\x-7 = 65$

Adding 7 on both sides of equation

$x-7+7 = 65+7\\x = 72$

Hence,

The equation is: $\frac{x-7}{5} = 13$ and the number is 72.

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3 years ago

Ten subjects are being studied to test the effectiveness of itch relief for three types of medication: A, B, and C. Using a 10-p

yan [13]

Answer: Choice C

They should be blocked by pain resistance so the subjects are as similar as possible.

============================================================

Explanation:

The process of blocking in statistics is where we group up people in blocks, and each block is determined by a characteristic of some sort. In this case, we're grouping people up by pain resistance level. Those very resistant to pain will be in one group, while those who easily feel pain will be in another block, and so on. It might be effective to have a pain scale and sort people by that.

Blocking is done so that we eliminate unwanted variability. We are testing the effectiveness of the itching cream, so all we care about is if the itch reduces or not. We aren't worried about the levels of pain. However, it says that "Previous studies have shown the effects of treatment may vary based on a subject's pain resistance". So we group up the people by pain tolerance to help eliminate the variability of pain tolerance levels.

This is why choice C is the final answer.

-------------

Extra info:

Choice A is false because a person's name doesn't have anything to do with if the treatment works or not.
Choice B is false because we weren't given any info to indicate it being true. It may be true, but we simply don't have enough info to confirm it.
Choice C is false for similar reasons as choice B.

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2 years ago

Read 2 more answers

1. A kitchen is shaped like a rectangle with dimensions of 4 ft by 7 ft. The

coldgirl [10]

Answer:

112 tiles

Step-by-step explanation:

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3 years ago

1.In a class of 45 pupils ,21play chess and 23 play cards and 5play both games

Mumz [18]

Step-by-step explanation:

(a)

ii.

21 - 5 = 16 play only chess.

iii.

23 - 5 = 18 play only cards

5 play both.

that is 16+18+5 = 39 that play at least one of these games.

so, 45 - 39 = 6 don't play any of these games.

(b)

we have 16+18 = 34 pupils out of 45 that play exactly one game.

so the probabilty to pick one of them is as usual

desired cases / total cases = 34/45 =

= 0.755555555... ≈ 0.76

8 0

2 years ago