The mean score of the maths test is 70 with a standard deviation if 12. Calculate the z-score of a student who got 55 marks. Interpret the result.

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MikeWrice4494

24.02.2023

Mathematics

$\huge\text{Hey there!}$

$\mathsf{5x - 4 = 31}$

$\large\textsf{ADD 4 to BOTH SIDES}$

$\mathsf{5x - 4 + 4 = 31 + 4}$

$\large\textsf{CANCEL out: -4 + 4 because that gives you 0}$

$\large\textsf{KEEP: 31 + 4 because that helps you solve for x}$

$\mathsf{31 + 4 = \bf 35}$

$\large\textsf{NEW EQUATION: 5x = 35}$

$\large\textsf{DIVIDE 5 to BOTH SIDES}$

$\mathsf{\dfrac{5x}{5}=\dfrac{35}{5}}$

$\large\textsf{KEEP: } \mathsf{\dfrac{35}{5}}\large\textsf{ because that helps you solve for x}$

$\large\textsf{New EQUATION: }\mathsf{x = \dfrac{35}{5}}$

$\mathsf{\dfrac{35}{7}= x}$

$\mathsf{\dfrac{35}{7}=\bf 7}$

$\boxed{\boxed{\large\textsf{\huge \bf x = 7 }}}\huge\checkmark$

$\text{Good luck on your assignment and enjoy your day!}$

~ $\frak{Amphitrite1040:)}$

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