A sample of 20 cigarettes of bran a has an average nicotine constant of 1.68 mg what's the standard deviation of 0.22 mg; 25 cigarettes a brand B has an average of 1.95 mg of nicotine with a standard deviation of 0.24 mg. Construct the 95% confidence interval for the difference between the two population means.

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Neoli is a nurse who works each day from 8: 00 am to 4: 00 pm at the blood collection centre. she takes 45 minutes for her lunch break. on average, it takes neoli 15 minutes to collect each sample and record the patient's details. on average, how many patients can neoli see each day?

9.4.34  question   to estimate the height of a stone  figure, an observer holds a small square up to her eyes and walks backward from the figure. she stops when the bottom of the figure aligns with the bottom edge of the  square, and when the top of the figure aligns with the top edge of the square. her eye level is 1.811.81 m from the ground. she is 3.703.70 m from the figure. what is the height of the figure to the nearest hundredth of a  meter?