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vovikov84 [41]
3 years ago
13

Please help me out 1/x+1/y=

Mathematics
1 answer:
Elena-2011 [213]3 years ago
7 0
<h2><u>ANSWER</u><u>✔</u></h2>

\large\underline\bold{GIVEN,}

\sf\dashrightarrow \dfrac{1}{x} +\dfrac{1}{y} = ?

\large\underline\bold{TO\:FIND,}

\sf\dashrightarrow THE\:SUM\:OF\:THE\:GIVEN\:EQUATIONS,

\large\underline\bold{SOLUTION,}

\sf\dashrightarrow  \dfrac{1}{x} +\dfrac{1}{y}

\sf\therefore \:cross\:multiplying\:the\:equation.

\sf\implies \dfrac{1 \times x}{x \times y} + \dfrac{1 \times y}{x \times y}

\sf\implies \dfrac{x+y}{xy}

\large{\boxed{\bf{\star\:\:  \dfrac{x+y}{xy} \:\: \star}}}

<h2><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u><u>_</u></h2>
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Answer:

a) σ  =  4933,64

b) CI 99%  = ( - 5746  ;  7194 )

c) No difference in brands

Step-by-step explanation:

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As n₁  =  n₂  = 8       Small sample  we work with t -student table

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√ σ²/n₁  +  σ²/n₂     =  √ 24340783/8   +  24340783/8

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CI 99%  =   724  ± 6470

CI 99%  = ( - 5746  ;  7194 )

As we can see CI 99% contains 0 and that means that there is not statistical difference between mean life of the two groups

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