Solve mathematics problem in photo please!
1 answer:
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Answer:
<em>The large sample size 'n' = 199.6569≅ 200</em>
Step-by-step explanation:
<u><em>Step(i)</em></u>:-
Given Standard deviation of salary for all baseball players for 2015 is about $5,478,384.55
<em>Standard deviation of of salary for all baseball players for 2015 </em>
<em> (S.D ) σ = $5,478,384.55</em>
Given estimate of this average salary for all baseball players for 2015
= $497,000
<em>Given Margin of error of error is = $497,000 </em>
<em>Level of significance ∝ = 80% </em>
<em>The critical value Z₀.₂₀ = 1.282 </em>
<u><em>Step(ii):</em></u><em>-</em>
<em>Margin of error of error is determined by</em>
<em> </em><em></em>
<em> </em><em></em>
Cross multiplication , we get
On calculation , we get
√n = 14.13
<em>Squaring on both sides, we get</em>
n = 199.6569
<u><em>Conclusion</em></u><em>:-</em>
<em>The large sample size 'n' = 199.6569≅ 200</em>
<em> </em>
<em></em>
Answer:
Jeff mows 9 yards of lawn in 30 minutes
Step-by-step explanation:
The equation that models the amount of time (t) in minutes it takes Jeff to mow an average sized yard is , where n is the number of yards he mows.
To find the number of yards Jeff mows in 30 minutes, we set the equation to 30 and solve for n.
Add -12 to both sides:
Divide both sides by 2
Hence Jeff mows 9 yards of lawn in 30 minutes.