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Yakvenalex [24]

2 years ago

14

two cards are selected from a standard deck of 52 playing cards. the first card is not replaced before the second card is select

ed. fine the probability of selecting a nine and then selecting a king?

1 answer:

MatroZZZ [7]2 years ago

7 0

Answer:

4/663

Step-by-step explanation:

(4/52)×(4/51)

= 4/663

= 0.00603

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Please help I need this done today I would appreciate it a lot

larisa [96]

Answer: Steak carrots cookie or corn dog cake slice and carrots

Step-by-step explanation: 342 + 42+253 = 637

212 + 513 +41 = 766

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The lightest puppy in a litter weighs 12 ounces, which is

Mazyrski [523]

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46 pounds

Step-by-step explanation:

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we believe that 42% of freshmen do not visit their counselors regularly. For this year, you would like to obtain a new sample to

Maksim231197 [3]

Answer:

A sample of 1077 is required.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is of:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

42% of freshmen do not visit their counselors regularly.

This means that $\pi = 0.42$

98% confidence level

So $\alpha = 0.02$ , z is the value of Z that has a pvalue of $1 - \frac{0.02}{2} = 0.99$ , so $Z = 2.327$ .

How large of a sample size is required?

A sample size of n is required, and n is found when M = 0.035. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.035 = 2.327\sqrt{\frac{0.42*0.58}{n}}$

$0.035\sqrt{n} = 2.327\sqrt{0.42*0.58}$

$\sqrt{n} = \frac{2.327\sqrt{0.42*0.58}}{0.035}$

$(\sqrt{n})^2 = (\frac{2.327\sqrt{0.42*0.58}}{0.035})^2$

$n = 1076.8$

Rounding up:

A sample of 1077 is required.

3 0

3 years ago

What are the coordinates of the vertex of the parabola described by the equation below? y = -7(x - 4)2 - 5

pochemuha

To get the vertex of the parabola we proceed as follows;
y=-7(x-4)^2-5
The above can be written as:
y=-7x^2+56x-117
The values of a,b and c are:
a=-7, b=56 and c=-117
x=-b/(2a)
x=-56/(-7*2)=4
but;
y=-7x^2+56x-117
y=-7(4)^2+56(4)-117
y=-5
Thus;
x=4 and y=-5
The vertex will be at point (4,-5)

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The odds of winning a goldfish toss game are 1:49. The probability of winning a claw game is 30%. Which game gives you a better

olga_2 [115]

Answer:

the claw game would give you a better %

Step-by-step explanation

when turned into a percent 1:49 becomes 2.040816326531% compared to the claw game that would give you a 30% chance of wining

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