Attendances at a high school's basketball games were recorded and found to have a sample mean and variance of 490 and 36, respectively. Calculate x ± s, x ± 2s, and x ± 3s.

a)

b)

c)

Step-by-step explanation:

sample mean

sample variance

sample standard deviation will be the square root of the sample variance:

Now we'll do our calculations:

a)

b)

c)

7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.

23/3   *   15/2   = 57 1/2

step-by-step explanation: