Random sample was selected from a normal distribution: 4.5, 6.4,2.3, 1.8,5.3, then the 95% confidence interval to estimate the population mean is between

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

Which point lies on a circle with a radius of 5 units and center at p(6, 1)?

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes