• 2021 April(Z04) Math Question 20

    Algebraic & Function Expressions

    - Solve Algebraic Expressions

    Solving equations
    Choice F

    It is given that

    z={x−μ}{σ}z=\frac\{x-\mu\}\{\sigma\}

    Also,

    μ=78,σ=6,z=2\mu=78,\quad \sigma=6,\quad z=2

    So by plugging in the values, we get

    2={x−78}{6}2=\frac\{x-78\}\{6\}
    12=x−7812=x-78
    x=12+78x=12+78
    x=90x=90

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