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4 years ago

The horsepowers of 12 sports cars are: 397, 320, 300, 310, 355, 362, 342, 375, 378, 402, 375, and 368.

1 answer:

3 0

Answer is C. 365

Step One: (Put the numbers in order from least to greatest)
300, 310, 320, 342, 355, 362, 368, 375, 375, 378, 397, 402,

Step Two: (FInd the number(s) that are directly in the middle).
- Normally it's one number, but since this is an even number (12). There's two in the middle. 362, 368.

Step Three: (Add them then divide | only do this when there's two numbers in the middle)
362 + 368 = 730.
730 divided by 2 = 365

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Answer: C) 0.112

Step-by-step explanation:

In binomial distribution with parameters n (Total trails) and p (probability of getting success sin each trial) , the probability of getting success in x trials is given by :-

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Here , getting heart is the success.

Then p= 0.25

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$P(X=7)=^{20}C_7(0.25)^7(1-0.25)^{20-7}$

$P(X=7)=\dfrac{20!}{7!(20-7)!}(0.25)^7(1-0.25)^{20-7}\ \ [\because\ ^nC_r=\dfrac{n!}{r!(n-r)!}]$

$=\dfrac{20\times19\times18\times17\times16\times15\times14\times13!}{7!13!}(0.25)^7(0.75)^{13}\\\\=77520(0.00006103515625)(0.0237572640181)\\\\=0.112406195476\approx0.112$

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Thus , the correct answer is C) 0.112 .

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