Average height

There are twice as many girls in the class as there are boys. The average height of girls is 177 cm, boys 186 cm. What is the average height of students in this class?

Correct answer:

a =  180 cm

Step-by-step explanation:

d=2c a = d+c177 d+186 c a = 2c+c177 2c+186 c  a=2+1177 2+186 1=180 cm

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Suppose the data you gathered is normally distributed. What is the probability that the
height of your classmates picked randomly is more than 143 cm. If the mean is 154.75 and the standard deviation is 9.69

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