Reach in your pocket (or on the side bench), and grab two coins. Toss them 36 times. Record the results below. Results Combinations Observed Number (O) Expected Number (E) Deviation (O-E) Heads on both HH Heads on one, tails on HT, TH the other Tails on both TT Totals 36

Calculate the standard deviation of the following set of numbers (show your work): 5 5 7 8 10

According to National Testing data, college math class testing times are normally distributed with a mean of 54 minutes and standard deviation 7 minutes. The bell curve below represents the probability distribution for testing times. The scale on the horizontal axis is equal to the standard deviation. Fill in the three indicated boxes. l = 54 o = 7

K Assume that adults have IQ scores that are normally distributed with a mean of μ = 105 and a standard deviation o=20. Find the probability that a randomly selected adult has an IQ between 89 and 121. Click to view page 1 of the table. Click to view page 2 of the table. The probability that a randomly selected adult has an IQ between 89 and 121 is (Type an integer or decimal rounded to four decimal places as needed.)

K The lengths of pregnancies are normally distributed with a mean of 269 days and a standard deviation of 15 days. a. Find the probability of a pregnancy lasting 308 days or longer. b. If the length of pregnancy is in the lowest 3%, then the baby is premature. Find the length that separates premature babies from those who are not premature. Click to view page 1 of the table. Click to view page 2 of the table. a. The probability that a pregnancy will last 308 days or longer is (Round to four decimal places as needed.) b. Babies who are born on or before (Round to the nearest integer as needed.) days are considered premature. .

Suppose six pet food stores in the area were surveyed, and the following data shows how many types of pet food each of them carries. 7,7,9, 9, 11, 11 Calculate the sample mean and the sample standard deviation. Round your answers to three decimal places. T = Number Number S=

Assume that thermometer readings are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. A thermometer is randomly selected and tested. For the case​below, draw a​ sketch, and find the probability of the reading.​ (The given values are in Celsius​ degrees.)   Between 0.25 and 1.25   Click to view page 1 of the table. LOADING... Click to view page 2 of the table. LOADING... Draw a sketch. Choose the correct graph below.     A.                   z=0.25z=1.25         A graph with a bell-shaped curve, divided into 3 regions by 2 lines from top to bottom, both on the right side. The region between the 2 lines is shaded. Moving from left to right, the z-axis below the first line is labeled "z=0.25". The z-axis below the second line is labeled "z=1.25".   B.                   z=0.25z=1.25         A graph with a bell-shaped curve, divided into 3 regions by 2 lines from top to bottom, both on the right side. Moving from left to right,…

Find the range, the standard deviation, and the variance for the given samples. Round non-integer results to the nearest tenth. 80, 82, 78, 45, 58, 52, 99, 86, 73