The mean systolic blood pressure for a random sample of 28 women aged 18-24 is 115.2 mm Hg and the standard deviation is 13.1 mm Hg.
Construct a 90 confidence interval for the standard deviation , of the systolic blood pressures of all women aged 18-24. Round to the nearest hundredth when necessary.
A) (11.23, 15.99 ) B) (10.22, 18.34 ) C) (10.59, 16.54 ) D) (10.75, 16.94 )
Question 2
The time (in years) until the first critical-part failure for a certain car is exponentially distributed with a mean of 3.4 years. Find the probability that the time until the first critical-part failure is less than 1 year.
A) 0.966627 B) 0.033373 C) 0.745189 D) 0.254811
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