In a test for acid rain, an SRS of 49 water samples showed a mean pH level of 4.4 with a standard deviation Of 0.35. Find the
margin of error and write an expression for the 90% confidence interval estimate for the mean pH level.

In trapezoid klmn, kj=19.2 and jm=22.5. identify ln.

Astandard american eskimo dog has a mean weight of 30 pounds with a standard deviation of 2 pounds. assuming the weights of standard eskimo dogs are normally distributed, what range of weights would 99.7% of the dogs have? approximately 26–34 pounds approximately 24–36 pounds approximately 28–32 pounds approximately 29–31 pounds

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.