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3 years ago

Hi can you guys help me know how to explain this?

1 answer:

6 0

10 x 25 = 250, well 20 x 25 is just double that, its 10 doubled x 25 so he probably just added it up. repeated addition really helps with times tables.

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2. The Welcher Adult Intelligence Test Scale is composed of a number of subtests. On one subtest, the raw scores have a mean of

IgorC [24]

Answer:

a) 37.31 b) 42.70 c) 0.57 d) 0.09

Step-by-step explaanation:

We are regarding a normal distribution with a mean of 35 and a standard deviation of 6, i.e., $\mu$ = 35 and $\sigma$ = 6. We know that the probability density function for a normal distribution with a mean of $\mu$ and a standard deviation of $\sigma$ is given by

$f(x) = \frac{1}{\sqrt{2\pi}\sigma}\exp[-\frac{(x-\mu)^{2}}{2\sigma^{2}}]$

in this case we have

$f(x) = \frac{1}{\sqrt{2\pi}6}\exp[-\frac{(x-35)^{2}}{2(6^{2})}]$

Let $X$ be the random variable that represents a row score, we find the values we are seeking in the following way

a) we are looking for a number $x_{0}$ such that

$P(X\leq x_{0})$ = $\int\limits^{x_{0}}_{-\infty} {f(x)} \, dx = 0.65$ , this number is $x_{0}$ =37.31

you can find this answer using the R statistical programming languange and the instruction qnorm(0.65, mean = 35, sd = 6)

b) we are looking for a number $x_{1}$ such that

$P(X\leq x_{1})$ = $\int\limits^{x_{1}}_{-\infty} {f(x)} \, dx = 0.9$ , this number is $x_{1}$ =42.70

you can find this answer using the R statistical programming languange and the instruction qnorm(0.9, mean = 35, sd = 6)

c) we find this probability as

$P(28\leq X\leq 38)$ = $\int\limits^{38}_{28} {f(x)} \, dx = 0.57$

you can find this answer using the R statistical programming languange and the instruction pnorm(38, mean = 35, sd = 6) -pnorm(28, mean = 35, sd = 6)

d) we find this probability as

$P(41\leq X\leq 44)$ = $\int\limits^{44}_{41} {f(x)} \, dx = 0.09$

you can find this answer using the R statistical programming languange and the instruction pnorm(44, mean = 35, sd = 6) -pnorm(41, mean = 35, sd = 6)

6 0

3 years ago

Read 2 more answers

20% of a restaurant customers order the chef’s special. 230 customers are anticipated to dine at the restaurant tonight. The sta

Serga [27]

Answer:

i don't knwo

Step-by-step explanation:

4 0

3 years ago

A 2b (3 a 2 + 4 ab 2 )

Gala2k [10]

Answer:

You should get 13

Step-by-step explanation:

3 0

3 years ago

If a graph shows the function y=3x what are the coordinates of the intercepts

vladimir2022 [97]

Answer:

graph{3x+5 [-10, 10, -5, 5]}

intercept:

−

intercept:

Explanation:

For a linear graph, the quickest way to sketch the function is to determine the

and

intercepts and draw a line between the two: this line is our graph.

Let's calculate the

intercept first:

With any function,

intercepts where

Therefore, substituting

into the equation, we get:

⋅

Therefore, the

intercept cuts through the point (0,5)

Let's calculate the

intercept next:

Recall that with any function:

intercepts where

The opposite is also true: with any function

intercepts where

If we substitute

, we get:

Let's now rearrange and solve for

to calculate the

intercept.

−

Therefore, the

intercept cuts through the point

(

−

)

Now we have both the

and

intercepts, all we have to do is essentially plot both intercepts on a set of axis and draw a line between them

The graph of the function

graph{3x+5 [-10, 10, -5, 5]}

3 0

3 years ago

What is the function to 5c+4=2 (c-5)

Vinvika [58]

To solve the function we proceed as follows:
5c+4=2(c-5)
opening the parentheses we get:
5c+4=2c-10
putting like terms together we get
5c-2c=-10-4
3c=-14
c=-14/3

4 0

3 years ago