Find the sample variance and standard deviation of: 21, 12, 3, 9, 11 s2=?

Question

Find the sample variance and standard deviation of:

21, 12, 3, 9, 11

s2=?

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Hải Đăng 4 years 2021-09-05T02:12:33+00:00 1 Answers 9 views 0

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  1. Tryphena
    0
    2021-09-05T02:14:04+00:00
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    Answer:

    42. 2

    6.496

    Step-by-step explanation:

    Given the data :

    21, 12, 3, 9, 11

    Variance :

    S² = Σ(x – m)² ÷ (n – 1)

    n = sample size = 5

    m = sample mean = Σx / n

    m = (21 + 12 + 3 + 9 + 11) / 5

    m = 11. 2

    (21-11.2)² + (12 -11.2)² + (3 – 11.2)² + (9-11.2)²

    + (11-11.2)² / (5 – 1)

    S² = 42.2

    Standard deviation, s = sqrt(42.2) = 6.496

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