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3 years ago

What’s the answer to this

Mathematics

1 answer:

slamgirl [31]3 years ago

5 0

Answer:

a. 28/50

d. 10/52

e. 52/52

Step-by-step explanation:

a. half of deck is black add the two red jacks

d. all of even card (2,4,6,8,10 times 2 because 2 blacks per colour)

e. all cards are either red or black

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Two competing headache remedies claim to give fast-acting relief. An experiment was performed to compare the mean lengths of tim

DaniilM [7]

Answer:

$t = 0.875$

Step-by-step explanation:

Given

Brand A Brand B

$n_ 1= 12$ $n_2 = 12$

$\bar x_1 = 21.8$ $\bar x_2 = 18.9$

$\sigma_1 = 8.7$ $\sigma_2 = 7.5$

Required

Determine the test statistic (t)

This is calculated as:

$t = \frac{\bar x_1 - \bar x_2}{s\sqrt{\frac{1}{n_1} + \frac{1}{n_2}}}$

Calculate s using:

$s = \sqrt{\frac{(n_1-1)*\sigma_1^2+(n_2-1)*\sigma_2^2}{n_1+n_2-2}}$

The equation becomes:

$s = \sqrt{\frac{(12-1)*8.7^2+(12-1)*7.5^2}{12+12-2}}$

$s = \sqrt{\frac{1451.34}{22}}$

$s = \sqrt{65.97}$

$s = 8.12$

So:

$t = \frac{\bar x_1 - \bar x_2}{s\sqrt{\frac{1}{n_1} + \frac{1}{n_2}}}$

$t = \frac{21.8 - 18.9}{8.12 * \sqrt{\frac{1}{12} + \frac{1}{12}}}$

$t = \frac{21.8 - 18.9}{8.12 * \sqrt{\frac{1}{6}}}$

$t = \frac{21.8 - 18.9}{8.12 * 0.408}}$

$t = \frac{2.9}{3.31296}}$

$t = 0.875$

3 0

3 years ago

Why are all parallelograms also trapezoids

Monica [59]

Answer:

A trapezoid has one pair of parallel sides and a parallelogram has two pairs of parallel sides. So a parallelograms are also trapezoids.

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2 years ago

Will the change in temp be positive or negative

tigry1 [53]

Negative, You'll have to explain the why part though,

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2 years ago

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A giraffe can run about 14 meters per second. Find it's speed in miles per hour

Inga [223]

(14 meter/sec) x (1 mile/1609.344 meter) x (3,600 sec/hour) =

(14 x 3600) / (1609.344) = 31.32 mile/hour (rounded)

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3 years ago

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Nookie1986 [14]

Answer:

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2 years ago