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Berat badan siswa di suatu SMA berdistribusi normal dengan rata-rata 62 kg dan standar deviasi 2 kg. Jika sebanyak 50 sampel masing-masing berukuran n dengan pengembalian dari populasi, banyak sampel yang diharapkan dengan nilai rata- rata z-nya antara 61,2 sampai dengan 63,4 adalah.

Berat badan siswa di suatu SMA berdistribusi normal dengan rata-rata 62 kg dan standar deviasi 2 kg. Jika sebanyak 50 sampel masing-masing berukuran n dengan pengembalian dari populasi, banyak sampel yang diharapkan dengan nilai rata- rata z-nya antara 61,2 sampai dengan 63,4 adalah.

  1. 44

  2. 45

  3. 46

  4. 47

  5. 48

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I. Roy

Master Teacher

Mahasiswa/Alumni Universitas Negeri Surabaya

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Pembahasan

Diketahui : n =16 Mean μ =62 Simpangan Baku ( σ )=2

Diketahui :

n=16

Mean μ=62

Simpangan Baku (σ)=2

P left parenthesis 61 comma 2 less or equal than X less or equal than 63 comma 4 right parenthesis equals P open parentheses fraction numerator 61 comma 2 minus mu over denominator begin display style fraction numerator sigma over denominator square root of n end fraction end style end fraction less or equal than Z less or equal than fraction numerator 63 comma 4 minus mu over denominator fraction numerator sigma over denominator square root of n end fraction end fraction close parentheses space  P left parenthesis 61 comma 2 less or equal than X less or equal than 63 comma 4 right parenthesis equals P open parentheses fraction numerator 61 comma 2 minus 62 over denominator begin display style fraction numerator 2 over denominator square root of 16 end fraction end style end fraction right parenthesis less or equal than Z less or equal than fraction numerator 63 comma 4 minus 62 over denominator fraction numerator 2 over denominator square root of 16 end fraction end fraction space close parentheses  P left parenthesis 61 comma 2 less or equal than X less or equal than 63 comma 4 right parenthesis equals P left parenthesis negative 1 comma 6 less or equal than Z less or equal than 2 comma 8 right parenthesis space  P left parenthesis 61 comma 2 less or equal than X less or equal than 63 comma 4 right parenthesis equals P left parenthesis 0 less or equal than Z less or equal than 1 comma 6 right parenthesis plus P left parenthesis 0 less or equal than Z less or equal than 2 comma 8 right parenthesis space  P left parenthesis 61 comma 2 less or equal than X less or equal than 63 comma 4 right parenthesis equals 0 comma 4452 plus 0 comma 4974 space  P left parenthesis 61 comma 2 less or equal than X less or equal than 63 comma 4 right parenthesis equals 0 comma 9426 space space  B a n y a k space s a m p e l space y a n g space d i h a r a p k a n space equals P left parenthesis 61 comma 2 less or equal than X less or equal than 63 comma 4 right parenthesis cross times 50 equals 0 comma 9426 cross times 50  equals 47 comma 13 almost equal to 47

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