The Earth’s atmosphere consists of distinct layers. The troposphere is the layer closest to Earth’s surface. The stratosphere begins just above the troposphere and extends up to 50 kilometers above Earth’s surface. The temperature increases from –51°C at the bottom of the stratosphere to –15°C at the top of the stratosphere. What is the temperature increase, in degrees Celsius, from the bottom to the top of the stratosphere?

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips. (a) what is the probability that a randomly selected bag contains between 1100 and 1500 chocolate chips, inclusive? (b) what is the probability that a randomly selected bag contains fewer than 1125 chocolate chips? (c) what proportion of bags contains more than 1225 chocolate chips? (d) what is the percentile rank of a bag that contains 1425 chocolate chips?

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed