PLEASE HELP! Bob’s Bricks has determined that a brick measuring 5 inches long has a z-score of +1 and a brick measuring 5.75 inches lo

Question

PLEASE HELP!
Bob’s Bricks has determined that a brick measuring 5 inches long has a z-score of +1 and a brick measuring 5.75 inches long has a z-score of +2.

What is the mean length of the bricks produced at Bob’s Bricks?

A.4.00 inches
B. 4.25 inches
C. 4.75 inches
D. 5.25 inches

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3 years 2021-08-23T16:36:03+00:00 1 Answers 4 views 0

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    0
    2021-08-23T16:37:50+00:00

    First, let’s calculate the standard deviation of the bricks.

    Standard deviation = 5.75 – 5 = 0.75

    Now, we need to use the z-score formula to calculate the mean.

    z-score = (observed value – mean) / standard deviation.

    Let’s plug our values into the formula above.

    1 = (5 – mean) / 0.75

    Multiply both sides by 0.75

    0.75 = 5 – mean

    Subtract 5 from both sides.

    -4.25 = -mean

    Divide both sides by -1

    4.25 inches = mean

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )