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3 years ago

Question 4

Mathematics

2 answers:

mrs_skeptik [129]3 years ago

8 0

Answer:

If that person lived to 75, their life expectancy increased to 86.8—9.3 years longer than the average child born in 2006.

Bumek [7]3 years ago

7 0

Answer:

A 75 year old person can be expected to live 11.7 more years

Step-by-step explanation:

Answer from Edmentum/ Plato

I hate this course with a passion! :)

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Expanding triple brackets, i will give brainliest

rewona [7]

Answer:

${x}^{3} + {x}^{2} −24x+36$

Step-by-step explanation:

$(x + 6)(x - 2)(x - 3)$

$[x(x−2)+6(x−2)](x−3)$

$( {x}^{2} −2x+6x−12)(x−3)$

$( {x}^{2} +4x−12)(x−3)$

${x}^{3} + {x}^{2} −24x+36$

<h3>Hope it is helpful....</h3>

4 0

2 years ago

A random sample of 35 undergraduate students who completed two years of college were asked to take a basic mathematics test. The

disa [49]

Answer:

The 90 % confidence limits are (-2.09, 8.09).

Since the calculated values do not lie in the critical region we accept our null hypothesis.

Step-by-step explanation:

The null and alternative hypothesis are given by

H0: σ₁²= σ₂² against Ha: σ₁² ≠ σ₂²

Confidence interval for the population mean difference is given by

(x`1- x`2) ± t √S²(1/n1 + 1/n2)

Where S ²= (n1-1)S₁² + S²₂(n2-1)/n1+n2-2

Critical value of t with n1+n2-2= 50+ 35-2= 83 will be -1.633

Now calculating

S ²=34* (12.8)²+ (14.6)²*49/83= 192.96

Now putting the values in the t- test

(75.1 -72.1) ± 1.633 √ 192.96(1/35 +1/50)

=3 ± 5.09

=-2.09, 8.09 is the 90 % confidence interval for the difference

The 90 % confidence limits are (-2.09, 8.09).

Since the calculated values do not lie in the critical region we accept our null hypothesis.

5 0

3 years ago

The polynomial −16t^2+550 gives the height of a ball t seconds after it is dropped from a 550-foot-tall building. Find the heigh

zhenek [66]

Answer:

486 feet

Step-by-step explanation:

h = -16t² + 550

h = -16(2)² + 550

h = 486

7 0

3 years ago

Find the surface area of the cylinder 6cm 6cm <br> Give your answer in terms of pi

Lisa [10]

Answer: A=2πrh+2πr2

Hope this helps you out! :}

4 0

2 years ago

Read 2 more answers

According to the empirical (69-95-99.7) rule, if a random variable z has a standard normal distribution, then approximately 95%

Dmitry_Shevchenko [17]

Using z-scores, it is found that the value of z is z = 1.96.

-----------------------------

Normal Probability Distribution

Problems of normal distributions can be solved using the z-score formula, which for a measure X, in a distribution with mean $\mu$ and standard deviation $\sigma$ , is given by:

$Z = \frac{X - \mu}{\sigma}$

It measures how many standard deviations the measure is from the mean.
Each z-score has an associated p-value, which is the percentile.

The normal distribution is symmetric, which means that the middle 95% is between the <u>2.5th percentile and the 97.5th percentile</u>.
The 2.5th percentile is Z with a p-value of 0.025, thus Z = -1.96.
The 97.5th percentile is Z with a p-value of 0.975, thus Z = 1.96.
Thus, the value of Z is 1.96.

A similar problem is given at brainly.com/question/16965597

7 0

2 years ago