NEED HELP ASAP!!! Will give brainlest

Mathematics

2 answers:

dusya [7]3 years ago

6 0

Answer with explanation
Solving 4*1/3
=13/3
Solving 2*3/5
=13/5
Divinding both as per rule
=13/3 /13/5
=13/3*5/13
Answer is a) part
If want further solving then 13 gets cancelled so answer will come 5/3
Hope it helps

jeka57 [31]3 years ago

3 0

Answer:13/3 *5/13

Step-by-step explanation:

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Based on the random sample of n=800 observations, we have obtained a sample proportion p(bar =0.44. the goal is to test: h(0: p?

uysha [10]

<span>The standard error of a distribution of sample proprtions is defined as the standard deviation of the distribution and is symbolized by
$SE(\hat{p})$
and is calculated by the formula
$SE(\hat{p})= \sqrt{ \frac{p(1-p)}{n} }$ </span>.

Given a <span>random sample of n = 800 observations and a sample proportion p = 0.44.

To test:
$H_0:\hat{p}\ \textgreater \ 0.48 \\ H_a:\hat{p}\ \textless \ 0.48$

The standard error rounded to four decimal places is given by:
$SE(\hat{p})= \sqrt{ \frac{0.44(1-0.44)}{800} } \\ \\ = \sqrt{ \frac{0.44(0.56)}{800} } = \sqrt{ \frac{0.2464}{800} } \\ \\ = \sqrt{0.000308} =\bold{0.0175}$ </span>

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2 years ago

Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8 inches. Find the z-score of a man 71.2 inches

Alexxandr [17]

Answer:

0.7857

Step-by-step explanation:

Given :

Mean = 69 inches

Standard deviation, = 2.8 inches

The Zscore of a man who is 71.2 inches

The ZSCORE is obtained using the relation :

Zscore = (Score, x - mean) / standard deviation

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3 years ago

2x−9y=14 x=−6y+7 x= y=

Assoli18 [71]

Answer:

x =7, y = 0

Step-by-step explanation:

$2x - 9y = 14...(1) \\ \\ x = - 6y + 7...(2) \\ \\ from \: equation \: (1) \: and \: (2) \\ \\ 2( - 6y + 7) - 9y = 14 \\ \\ - 12y + 14 - 9y = 14 \\ \\ - 21y = 14 - 14 \\ \\ - 21y = 0 \\ \\ y = \frac{0}{ - 21} \\ \\ \huge \red{ y = 0} \\ \\ x = - 6 \times 0 + 7 \\ \\ x = 0 + 7 \\ \\ \huge \purple{x = 7}$