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The length of life of a washer is approximately normally distributed with mean of 3.1 years and a standard deviation of 1.2 years.?
if this type of washer is guaranteed for one year what fraction of original sales will require replacement?
The time it takes you to come to school is approximately normally distributed with a mean of 45 minutes and a standard deviation of 3minutes?
what time must you leave home in the morning so that you are 95% sure of arriving at school b 9:00 AM
lol . why me D: . but nvm then .
1)μ = 3.1
σ = 1.2
standardize x to z = (x - μ) / σ
P(x < 1) = P( z < (1-3.1) / 1.2)
= P(z < -1.75) = 0.0401 ( 4 percent)
(From Normal probability table)
2)From the normal probability table, P( z < 1.645) = 0.95
z = (x - μ) / σ
1.645 = (x-45) / 3
x = (3)(1.645) + 45
x = 49.935
You must leave 49.94 minutes before 9:00 AM (approximately 8:10 AM)
wasn't that hard really . lol
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