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3 years ago

I need help with this now please

Mathematics

2 answers:

devlian [24]3 years ago

6 0

It would have to be 3/7 because then a could be anything and both sides would still have the same value.

VladimirAG [237]3 years ago

4 0

The missing value is also 3/7, because if there was infinitely many solutions, then the two sides of the equation will equal each other.

Hope this helped!!

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Given : Scores on a certain intelligence test for children between ages 13 and 15 years are approximately normally distributed with $\mu=106$ and $\sigma=15$ .

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$P(x>92)=1-P(x\leq92)\\\\=1-P(\dfrac{x-\mu}{\sigma}\leq\dfrac{92-106}{15})\\\\=1-P(z\leq })\\\\=1-P(z\leq-0.93)=1-(1-P(z\leq0.93))\ \ [\because\ P(Z\leq -z)=1-P(Z\leq z)]\\\\=P(z\leq0.93)=0.8238\ \ [\text{By using z-value table.}]$

Hence, the proportion of children aged 13 to 15 years old have scores on this test above 92 = 0.8238

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