Using the formula, find the coefficient of skewness for each distribution, and describe the shape of the distribution.

a. mean 10, median 8, standard deviation 3.
b. mean 42, median 45, standard deviation 4.
c. mean 18.6, median 18.6, standard deviation 1.5.
d. mean 98, median 97.6, standard deviation 4.

a) As =  0.67  right skewness

b) As =  -0.75  left skewness

c) As =  0   ( Symmetric )

d) As = 0.1 ( slightly unsimmetric ) right skewness

Step-by-step explanation:

We will use the formula

As = skewness coefficient

μ  = mean of distribution

Μ = median of distribution

And Pearson formula :     As = ( μ - Μ) / σ

a)  As = ( 10- 8 ) /3      =2/3  = 0.67

The distribution is right-skewness  (positive skewness)

b) As = ( 42 - 45 ) / 4  = -3/4 = -0.75

The distribution is left skewness  (negative skewness)

c) As = ( 18.6 - 18.6 )/ 1.5      = 0

The curve of the distribution is is symmetric

d) As = ( 98 - 97.6 ) / 4    = 0.4/4  = 0.1

The distribution is right skewness (slightly unsimmetric)

75 tickets have been sold so far.

step-by-step explanation:

in this question it is clearly mentioned that 45 children's tickets have been sold and this number is 60% of the total tickets sold.

now let's assume the total number of tickets sold be x.

then 60% of x = 45

⇒

⇒ x(.6) = 45

by dividing with .6 on both the sides of the equation

⇒ x = 75

therefore 75 tickets have been sold so far.

687.09 dollars       happy now

step-by-step explanation: 6870

1857 times .63 equals 1169.91 subtract that from 1857 you get 687.09