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3 years ago

I need help someone please

Mathematics

1 answer:

IgorLugansk [536]3 years ago

7 0

Answer: The answers are in the steps.

Step-by-step explanation:

A) 4 $\frac{1}{2}$ = 9/2 * 13 = 117/2

B ) 13 ( 58 + 1/2)

= 754 + 6.5

= 760.5

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. A discount brokerage selected a random sample of 64 customers and reviewed the value of their accounts. The mean was $32,000 w

koban [17]

Answer:

The 90% confidence interval is $\$ \ 30313.9< \mu < \$ \ 33686.13$

Step-by-step explanation:

From the question we are told that

The sample size is n = 64

The sample mean is $\= x = \$ 32, 000$

The standard deviation is $\sigma= \$ 8, 200$

Given that the confidence interval is 90% then the level of significance is mathematically evaluated as

$\alpha = 100 - 90$

$\alpha = 10 \%$

$\alpha = 0.10$

Next we obtain the critical value of $\frac{ \alpha }{2}$ from the normal distribution table , the value is

$Z_{\frac{\alpha }{2} } = 1.645$

Generally the margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \frac{ \sigma }{ \sqrt{n} }$

=> $E = 1.645 * \frac{ 8200 }{ \sqrt{64} }$

=> $E = 1686.13$

The 90% confidence interval is mathematically represented as

$\= x - E < \mu < \= x + E$

=> $32000 - 1689.13 < \mu < 32000 + 1689.13$

=> $\$ \ 30313.9< \mu < \$ \ 33686.13$

5 0

4 years ago

The world record for the 24 hour run for women on all surfaces is 255.303 kilometers, set by mami kudo of Japan in 2011. What wa

irina1246 [14]

Hello! I can help you with this! So, Mami Kudo ran 255.303 kilometers in 24 hours. I’m guessing that we have to find the answer in kilometers per hour. 255.303/24 is 10.6376 and other numbers or 10.64 when rounded to the nearest hundredth. Mami Kudo’s average speed was about 10.64 kilometers per hour.

4 0

4 years ago

Use intercepts to graph the linear equation −x+2y=7

julia-pushkina [17]

Answer:

Please refer to the attachment

Hope it helps

Please mark me as the brainliest

Thank you

7 0

3 years ago

What is the side length of an equilateral triangle that has a perimeter of 24.6 cm ?

stepan [7]

The length of an equilateral triangle is C. 8.2 cm

4 0

3 years ago

Records for the past several years show that 46% of customers at a local game shop use a customer loyalty card. Due to a recent

Ratling [72]

Answer:

1. Null hypotheses: p=0.49

Alternative hypotheses: p>0.49

2. p=0.5704 or 57.04%

Step-by-step explanation:

We have to writer the hypotheses for testing the proportion has increased from 49%. So, the population proportion that is to be tested is 0.49.

As we already know that the null hypotheses always contain equality so,

Null hypotheses: p=0.49

and we have to test whether the proportion has increased from 0.49, so,

Alternative hypotheses: p>0.49

Thus, the hypotheses for testing the proportion has increased from 49% are

Null hypotheses: p=0.49

Alternative hypotheses: p>0.49

We have to find the proportion of sampled customers using loyalty card.

The given sample indicate that 77 out of 135 customers are using loyalty card. So,

p=x/n

where x is the number of favorable outcome and n is total number of outcome.

Here, x=77 and n=135. So,

p=77/135=0.5704 or 57.04%

6 0

3 years ago