BruhIBamirite Posted December 11, 2017 Report Share Posted December 11, 2017 https://gyazo.com/9922633568ba59159f09f6beecd2c5a1 https://gyazo.com/0fdcf872f39a4f3a016312c15308b6d9 Thank you Reply Link to post Share on other sites More sharing options...
kw0573 Posted December 11, 2017 Report Share Posted December 11, 2017 1. P = 0.3 ==> z = 0.5244 = (μ - 32)/σ . P = 0.85 ==> z = 1.0364 = (44 - μ)/σ, 44 > μ > 32. Some calculators give negative values for z scores in x < 0. Just make sure the signs match on both sides (positive = positive, or negative = negative). μ = 36.0, σ = 7.69 2. a) P = 0.1057 ==> z = 1.25 = (5 - 4) / σ, σ = 1/1.25 = 0.8 b) Find probability of X from 4.5 to 5.5. You can just directly plug in calculator: 0.47 1 Reply Link to post Share on other sites More sharing options...
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