I have a few multiple choice questions i need help with. thank u.

1) A private school offers 14 courses. The school is divided by age and 20% of the students in each age group are sampled. this type of sampling is called:

a)simple random sampling

b)systemic random sampling

c)stratified random sampling

d)cluster random sampling

2) A police officer surveys every 10th driver for a random check up at the boarder. This type of sampling is called:

a)simple random sampling

b)systemic random sampling

c)stratified random sampling

d) cluster random sampling

3)The names of 30 students are placed in a bag and 5 students are selected to be surveyed. This is an example of:

a)simple random sampling

b)systemic random sampling

c)stratified random sampling

d)cluster random sampling

4)Walmart cashiers inform all grocers that they will be entered in a draw to win 150$ store gift cards if they fill out survey. This is an example of:

a)simple random sampling

b)systemic random sampling

c)stratified random sampling

d)cluster random sampling

5)Which of the following is a leaded question?

a)since swimming is a great cardio exercise, do you think people should swim regularly?

b)since lifting weights is a great muscle building exercise, do you think people should lift weights?

c)how much water do you drink everyday?

d)both a and b