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3 years ago

Sam bought 6 pens for an unknown price plus a

1 answer:

5 0

So sam bought SIX pens for a TOTAL of $28.50. we have to figure out how much money each of the six pens cost.

steps:

1. divide the total by the amount of items purchased:

28.50 / 6 = 4.75

and there’s your answer! each pen cost $4.75

steps to check your work:

1. multiply the single cost by the amount of items purchased:

4.75 ( 6 ) = 28.50

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Guys I need the RUGHT ANSWER ASAP PLZ IS IT

mrs_skeptik [129]

Answer = 4 ft

Radius = Circumference / (pi x 2)

Radius = 8 / (4 x 2)

Radius = 4

8 0

3 years ago

In an investigation of pregnancy-induced hypertension, one group of women with this disorder was treated with low-dose aspirin,

AleksandrR [38]

Answer:

Step-by-step explanation:

Given that in an investigation of pregnancy-induced hypertension, one group of women with this disorder was treated with low-dose aspirin, and a second group was given a placebo. A sample consisting of 50 women who received aspirin has mean arterial blood pressure 120mmHg and standard deviation 10mmHg; a sample of 42 women who were given the placebo has mean blood pressure 115mmHg and standard deviation 12mmHg.

Population variances are equal

$H_0: \bar x = \bar y\\H_a: \bar x \neq \bar y$

(two tailed test at 5% significance level)

Here x denotes group I and Y group II

N Mean StDev SE Mean

Sample 1 50 120 10 1.4142

Sample 2 42 115 12 1.8516

Pooled std deviation = 10.9565

df=80

Mean difference= 5

Test statistic t = mean diff/std error = $\frac{5}{2.3299}$ =2.1803

p value = 0.0318

since p <0.05 we reject H0

b) We find p >0.01 hence at 1% significance level we accept H0

This implies that 99% confidence interval contains mean difference =0

4 0

4 years ago

Ashley baked 3 dozen cupcakes for a bake sale. If she sold all the cupcakea for $.75 each, how much money would she collect?

antoniya [11.8K]

Answer:

She would collect $27.

Step-by-step explanation:

A dozen means that it is a set of twelve items, so in order to find the amount of cupcakes she sold, you have to multiply 12 for the number of dozens she baked which was 3:

12*3=36

Now that you know the number of cupcakes she sold, you have to multiply this for the price of each cupcake:

36*$0.75= $27

According to this, the answer is that she would collect $27.

4 0

3 years ago

an object accelerates from rest to a velocity of 4.om / s over a distance of 20m . what was it's acceleration

AfilCa [17]

Acceleration is the change in velocity over time. There's are formula's for such problems which are called kinematics equations. Look em up. One of them doesn't have t (time) in them you would normally use that one to solve this problem. 16/2/20=a=0.4m/s^2

I did it for you but please look it up, understand and memorize it ;)

7 0

3 years ago

Two samples, each with n=5 scores, have a pooled variance of 40. What is the estimated standard error for the sample mean differ

quester [9]

Estimated standard error for the sample mean difference= 17.93

<u>Step-by-step explanation:</u>

<u> </u>Given data,

n=5

variance, σ =40

Standard error = σ / sqrt (n)

= 40/ sqrt (5)

= 40/2.23

=17.93

Estimated standard error for the sample mean difference= 17.93

5 0

4 years ago