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corbinfisher
09.04.2020 •
Mathematics
The lifespans of lizards in a particular zoo are normally distributed. The average lizard lives 3.1 1 years; the standard deviation is .06.
Use the empirical rule (68- 95- 99.7 percent) to estimate the probability of a lizard living less than 2.5 years. PLS HELP
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Ответ:
16%
Step-by-step explanation:
Calculate the z score.
z = (x − μ) / σ
z = (2.5 − 3.1) / 0.6
z = -1
According to empirical rule, 68% is between -1 and +1 standard deviations.
P(-1 < Z < 1) = 68%
Since normal distributions are symmetrical, 34% is between -1 and 0 standard deviations.
P(-1 < Z < 0) = 68% / 2 = 34%
And since 50% is less than 0 standard deviations, that means 16% is less than -1 standard deviations.
P(Z < -1) = 50% − 34% = 16%
Ответ:
Step-by-step explanation:
Multiply both sides by 3
Add
both sides