1) -1.4=(x-62.5)/2.5
2) Suppose that x = 0.2, μ = 0.25, σ = 0.3, and z = ( x - μ )/σ .
Find the value of z. z should be given in decimal form.
3) A certain class has 20 freshmen, 13 sophomores, 12 juniors, and 15 seniors. Approximately 30% of the class are male students. How many male students are in the class?
4) Write these numbers in increasing numerical order:
1/25, 0.01, 0.0062, 4/99
+4473 1.) Multiply both sides by 2.5 and add 62.5 to get x.
2.) Simply plug all the values into the formula for the z-score.
3.) The class has a total of 20+13+12+15 = ? students. What is 30% of ?. That is your answer.
4.) 0.01 is the same as 1/100. 0.0062 is the same as 62/1000. Note that 4/99 is almost like 4/100. You should be able to figure out the order.
+4473 1.) Multiply both sides by 2.5 and add 62.5 to get x.
2.) Simply plug all the values into the formula for the z-score.
3.) The class has a total of 20+13+12+15 = ? students. What is 30% of ?. That is your answer.
4.) 0.01 is the same as 1/100. 0.0062 is the same as 62/1000. Note that 4/99 is almost like 4/100. You should be able to figure out the order.
