The distribution of the number of chocolate chips (x) in a cookie is shown in the following table. Find the mean and the variance of the number of chocolate chips in a cookie. Give answers to four decimal places, if necessary.
4.95; 3.3475
Mathematics
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Use cross products to determine whether the pair of fractions is equivalent.
and 
A. not equivalent B. equivalent
Mathematics
Solve the problem.A balloon (in the shape of a sphere) is being inflated. The radius is increasing at a rate of 1 cm per second. Find a function, r(t), for the radius in terms of t. Find a function, V(r), for the volume of the balloon in terms of r. Find (V ? r)(t).
A. (V ? r)(t) = 
B. (V ? r)(t) = 
C. (V ? r)(t) = 
D. (V ? r)(t) = 
Mathematics
Perform the indicated subtraction.67 - (-18)
A. -49 B. 49 C. 85 D. -85
Mathematics
Simplify the expression.
A. 3 B. -3 C. -15 D. 15
Mathematics