DISTRIBUSI PROBABILITA
KONTINU
1.
PT Hari Jaya memproduksi barang pecah belah seperti
gelas, piring dll. Perusahaan memberikan kesempatan
kepada konsumen untuk menukar barang yang telah
dibeli dalam hari itu apabila ditemui barang cacat.
Selama pelaksanaan program ini, ada 10 orang ratarata yang menukarkan barang karena cacat dengan
standar deviasi 4 orang per hari. Berapa peluang ada 20
orang yang melakukan penukaran barang pada suatu
hari
DISTRIBUSI PROBABILITA
KONTINU
2.
Diketahui X mempunyai distribusi normal dengan ratarata 20 dan deviasi standar 4. Hitunglah probabilta
bahwa rata-rata sampel X yang didasarkan pada sampel
sebesar 64 akan :
a. melebihi 21
b. terletak antara 19 dan 21
c. melebihi 18
DISTRIBUSI PROBABILITA
KONTINU
3.
In an office building the waiting time for an elevator is found to be
uniformly distributed between zero and five minutes.

What is the probability density function f(x) for this uniform
distribution?

What is the probability of waiting longer than 3.5 minutes?

What is the probability that the elevator arrives in the first 45
seconds?

What is the probability of a waiting time between one and
three minutes?

What is the expected waiting time?
4.
Mensa is the international high-IQ society. To be a Mensa
member, a person must have an IQ of 132 or higher. If IQ scores
are normally distributed with a mean of 100 and a standard
deviation of 15, what percentage of the population qualifies for
membership in Mensa?