True or false please help thank you
1 answer:
Answer:
True.
<em>See</em><em> </em><em>below</em><em> </em><em>for</em><em> </em><em>explanation</em><em>.</em><em> </em>
Step-by-step explanation:
<u>Reason</u><u> </u><u>1</u>
- When we solve the equation by combining both equations in one, the variable will become 0.
<u>Proof</u>
Combine like terms.
See that the equation is false no matter which numbers you substitute in x-term.
<u>Reason</u><u> </u><u>2</u>
- Both graphs are parallel and don't have any intercepts to each others.
<em>See the attachment below for graphs</em>.
Since both graphs do not really have intercepts, that means they do not provide any solutions. Hence, no solutions.
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Answer:
Mean=50.
standard deviation=50.
Step-by-step explanation:
Let the perfect score be 100.
The mean(average) of a data is given by:
Here the number of data points are 100. out of which 50 attains a value 100,and 50 attains value 0.
so, sum of data points=50×100+50×0=5000.
Mean=50.
"Now the standard deviation of data points are calculated by firstly subtracting mean from every entry and then square the number and take it as new entry and calculate the mean of the new data entry and lastly taking the square root of this new mean".
Here if 50 is subtracted from each entry the new entry will have 50 entries as '50' and 50 entries as '-50'.
next on squaring we will have all the 100 entries as '2500'.
now the mean of these entries is:
=2500
taking it's squareroot we have
Hence, standard deviation=50.