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rewona [7]
3 years ago
14

From a deck of 52 cards, two cards are radomly drawn without replacement. Which expression represents the probability of drawing

two hearts?
A. 2/52
B. 13/52· 13/51
C. 13/52· 12/51
D. 13/52· 13/52
Mathematics
1 answer:
tatuchka [14]3 years ago
6 0
There are 13 hearts in a standard deck of 52 cards.

So the probability of picking a heart is 13/52.

The probability of picking another card and not replacing the heart we drew will be 12/51, because we are short on 1 heart.

So the expression is:

13/52 * 12/51
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Answer:

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Step-by-step explanation:

Poisson distribution:

A discrete random variable X having the enumerable set {0,1,2,....} as the spectrum, is said to be Poisson distribution.

P(X=x)=\frac{e^{-\lambda t}({-\lambda t})^x}{x!}  for x=0,1,2...

λ is the average per unit time

Given that, a job arrives at a web server with the probability 0.03.

Here λ=0.03, t=57 second.

The probability that at lest one job will be missed in 57 second is

=P(X≥1)

=1- P(X<1)

=1- P(X=0)

=1-\frac{e^{-1.71}(1.71)^0}{0!}

=1- e^{-1.71}

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3 years ago
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10.5

Step-by-step explanation:

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3 years ago
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A group of mathematical symbols that express a relationship or that are used to solve a problem is a FORMULA
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We measure the diameters for a random sample of 25 oak trees in a neighbourhood. Diameters of oak trees in the neighbourhood fol
jarptica [38.1K]

Answer:

The required confidence inteval = 94.9%.

Step-by-step explanation:

Confidence interval: Mean ± Margin of error

Given: A confidence interval for the true mean diameter of all oak trees in the neighbourhood is calculated to be (36.191, 42.969).

i.e.  Mean + Margin of error = 42.969               (i)

Mean - Margin of error = 36.191                    (ii)

Adding (i) and (ii), we get

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Margin of error = 42.969-39.58             [from (i)]

= 3.389

Margin of error = t^* \dfrac{\sigma}{\sqrt{n}}

here n= 25 , \ \sigma=8.25

i.e.

3.389=t^*\dfrac{8.25}{5}\\\\\Rightarrow\ t^* = \dfrac{3.389}{1.65}\\\\\Rightarrow\ t^* =2.0539 \

Using  excel function 1-TDIST.2T(2.054,24)

The required confidence inteval = 94.9%.

7 0
3 years ago
Eva incorrectly classifies the quotient -(-81/-9) as positive.
NISA [10]
The answer is negative because, ( -81/-9) =(+9). -(+9) = -9. Maybe for got the - sign before the equation
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3 years ago
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