I need please it would really help me alot !! no link or zooms

A survey found that the median number of calories consumed per day in a certain country was 3,304 and the mean was 3,204.9 calor

insens350 [35]

Answer:

Skewed to the left

Step-by-step explanation:

Given

$Median = 3304$

$Mean = 3204.9$

Required

The type of distribution

From the given data, we have:

$Median \ne Mean$ --- Mean and Median are not equal

and

$Median > Mean$ --- Median is greater than mean

When the median is greater than the mean; the histogram is expected to be left skewed

5 0

4 years ago

A professor wants to estimate the average time it takes his students to finish a computer project. Based on previous evidence, h

vova2212 [387]

Answer:

A sample size of 3 is required.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.96}{2} = 0.02$

Now, we have to find z in the Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.02 = 0.98$ , so Z = 2.054.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

Based on previous evidence, he believes that the standard deviation is approximately 3.6 hours.

This means that $\sigma = 3.6$

He would like to be 96% confident that his estimate is within 5 hours of the true population mean. Use RStudio to determine how large of a sample size is required without rounding any interim calculations.

The sample size needed is of n, and n is found when M = 5. So

$M = z\frac{\sigma}{\sqrt{n}}$

$5 = 2.054\frac{3.6}{\sqrt{n}}$

$5\sqrt{n} = 2.054*3.6$

$\sqrt{n} = \frac{2.054*3.6}{5}$

$(\sqrt{n})^2 = (\frac{2.054*3.6}{5})^2$

$n = 2.19$

Rounding up:

A sample size of 3 is required.

4 0

3 years ago

WILL MAKE BRAINLIEST PLEASE HELP

garri49 [273]

3) B
4) D
5) B
6)C
7) B
8)A

8 0

3 years ago

A triangle has side lengths of (7x-4)(7x−4) centimeters, (x+3)(x+3) centimeters, and (3y+2)(3y+2) centimeters. Which expression

Papessa [141]

Answer:

This assumes that the question was meant to read:

"A triangle has side lengths of (7x−4) centimeters, (x+3) centimeters, and (3x+2) centimeters." And not "A triangle has side lengths of (7x-4)(7x−4) centimeters, (x+3)(x+3) centimeters, and (3y+2)(3y+2) centimeters."

If the revision is correct, the perimeter is 11x + 1 cm

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

If the question was correctly written, then answer is:

50x^2 - 50x + 9y^2 + 12 y + 29

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

Step-by-step explanation:

(7x-4) cm

+ (x+3) cm

+ (3x+2) cm

11x + 1 cm

If the question was correctly written as is, then:

(7x-4)(7x−4) = 49x^2 - 56x + 16

+(x+3)(x+3) = + x^2 + 6x + 9

+(3y+2)(3y+2) = +9y^2 + 12 y + 4

50x^2 - 50x + 9y^2 + 12 y + 29 cm

8 0

3 years ago

A researcher measured approximately 0.005123 grams of bacteria in a sample. How is this number expressed in scientific notation?

kicyunya [14]

Answer:

5.123 × 10-3

m × 10n, where m is a number between 1 and 10 ( 1 ≤ |m| < 10 ) and the exponent n is a positive or negative integer.

I hope this helps.. :D

4 0

3 years ago