Aschool employs 75 teachers. the following table summarises their length of service at the school,
classified by gender.

less than 3 years 3 years to 8 years more than 8 years
female 12 20 13
male 8 15 7

(i) find the probability that a randomly selected teacher:

(i) is female;
(ii) is female, given that the teacher has more than 8 years service.

There are

female teachers, and

male teachers.

This means that, out of a total of 75 teachers, 45 are female, leading to a probability of

of selecting a female teacher.

If we restrict to those with more than 8 years service, there are 13 female teachers and 7 male teachers.

So, out of a total of 21 teachers, there are 13 female teachers, leading to a probability of

of selecting a female teacher.

"image"

step-by-step explanation:

in most of these problems, the notation is that the point with a "prime" is the image of the point without. that is, b' is the image of b.

here, there is no dilation or reflection. there is simply translation (with no direction shown). which figure you call the "preimage" and which one you call the "image" is up to you. as a matter of convention, the naming is as described above.

3 qrs + 3/2 xy hope this : /

step-by-step explanation: