The weights of bags of red gravel may be modelled by normal distribution with
mean 25.8 kg and standard deviation of 0.5 kg.
(a) determine the probability that a randomly selected bag of red gravel will
have a weight:
(i) less than 25 kg;

The probability is 0.0548 if the weight of the bag of red gravel is 25kg.

Step-by-step explanation:

P(x<25)

=

=

=

=

Using z-table:

P(x<25)

=

=

=0.0548

Hence, the probability is 0.0548.

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,