Jack's birthday is in 4 weeks. how many days is it until jacks birthday? describe how you ould use a number line to solve.

28 days

Step-by-step explanation:

There are 7 days in 1 week. We can find the amount in 4 weeks by multiplying the amount of 7 by 4.

7(4)=28 days

We can use a number line to solve this by making 4 groups of 7.

0                     7                       14                         21                        28

Mean = 1.013

Step-by-step explanation:

We are given that the lifetime risk of developing pancreatic cancer is about one in 78 (1.28%).

Let X = the number of people you ask before one says he or she has pancreatic cancer.

So, in geometric distribution; X ~ Geo(p)

where p is proportion of people who does not have pancreatic cancer i.e.;

1 - 0.0128 = 0.9872

So, X ~ Geo(0.9872)

Now, the mean of geometric distribution is =

So, Mean of variable  = (1/0.9872) = 1.013 .