Ask question

Ask question

All categories

2 years ago

12

Our math class is having a field trip . The ratio of boys to girls joining the field trip is 11:4.

1 answer:

Umnica [9.8K]2 years ago

4 0

Well that’s un evenn

You might be interested in

A different species of cockroach has weights that are approximately Normally distributed with a mean of 50 grams. After measurin

Ratling [72]

Answer:

The standard deviation of weight for this species of cockroaches is 4.62.

Step-by-step explanation:

Given : A different species of cockroach has weights that are approximately Normally distributed with a mean of 50 grams. After measuring the weights of many of these cockroaches, a lab assistant reports that 14% of the cockroaches weigh more than 55 grams.

To find : What is the approximate standard deviation of weight for this species of cockroaches?

Solution :

We have given,

Mean $\mu=50$

The sample mean x=55

A lab assistant reports that 14% of the cockroaches weigh more than 55 grams.

i.e. P(X>55)=14%=0.14

The total probability needs to sum up to 1,

$P(X\leq 55)=1-P(X>55)$

$P(X\leq 55)=1-0.14$

$P(X\leq 55)=0.86$

The z-score value of 0.86 using z-score table is z=1.08.

Applying z-score formula,

$z=\frac{x-\mu}{\sigma}$

Where, $\sigma$ is standard deviation

Substitute the values,

$z=\frac{x-\mu}{\sigma}$

$1.08=\frac{55-50}{\sigma}$

$1.08=\frac{5}{\sigma}$

$\sigma=\frac{5}{1.08}$

$\sigma=4.62$

The standard deviation of weight for this species of cockroaches is 4.62.

4 0

2 years ago

9 x 9 x 9 x 9 x 9 x 9 x 9 x 9 x 9

Helen [10]

Answer:

387420489

Step-by-step explanation:

9 x 9 x 9 x 9 x 9 x 9 x 9 x 9 x 9 = 387420489

Have a lovely day! ~Pooch ♥

7 0

2 years ago

Read 2 more answers

Simplify 4a+a+6a <br> Help!!!

maw [93]

Your answer here is 11a

5 0

2 years ago

Read 2 more answers

A well know Statistical Institution claims that the average College tuition for a law degree costs at least thirty five thousand

kirill [66]

Step-by-step explanation:

Below are the null and alternative Hypothesis,

Null Hypothesis, H0: μ = 35000

Alternative Hypothesis, Ha: μ < 35000

Test statistic,

z = (xbar - mu)/(sigma/sqrt(n))

z = (33450 - 35000)/(5978/sqrt(50))

z = -1.83

P-value Approach

P-value = 0.0336

As P-value >= 0.02, fail to reject null hypothesis.

There is not sufficient evidence to conclude that the average College tuition for a law degree costs at least thirty five thousand dollars.

4 0

2 years ago

"For each power, write an equivalent multiplication expression with two factors"

Eva8 [605]

<h2>10⁴ = 10²⁺² = 10² × 10² </h2><h2>8² = 8¹⁺¹ = 8¹ × 8¹ </h2><h2 /><h2 />

3 0

2 years ago