Given that,y1=66,y2=75,Z1=−0.6,Z2=1.1,thenZ=y−μσ∴−0.6=66−μσ ⟹ −0.6σ=66−μ,∴1.1=75−μσ ⟹ 1.1σ=75−μ,by multiplying the first equation by (-1) and then adding the result to the second equation1.7σ=−66+75=9 ⟹ σ=91.7≈5.294,μ=66+0.6(5.294)=69.1764Given \;that,\\ y_{1}=66,y_{2}=75,Z_{1}=-0.6,Z_{2}=1.1,then\\ Z=\frac{y-\mu}{\sigma}\\ \therefore -0.6=\frac{66-\mu}{\sigma}\implies -0.6\sigma=66-\mu,\\ \therefore 1.1=\frac{75-\mu}{\sigma}\implies 1.1\sigma=75-\mu,\\ \text{by multiplying the first equation by (-1) }\\ \text{and then adding the result to the second equation}\\ 1.7 \sigma=-66+75=9\implies \sigma=\frac{9}{1.7}\approx 5.294,\\ \mu=66+0.6(5.294)=69.1764\\Giventhat,y1=66,y2=75,Z1=−0.6,Z2=1.1,thenZ=σy−μ∴−0.6=σ66−μ⟹−0.6σ=66−μ,∴1.1=σ75−μ⟹1.1σ=75−μ,by multiplying the first equation by (-1) and then adding the result to the second equation1.7σ=−66+75=9⟹σ=1.79≈5.294,μ=66+0.6(5.294)=69.1764
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