Please help me and give me an explanation

Hello!

Let's get important information in the exercise:

First, we need to know the total height (sum all students height). So, we can multiply the number of students by the mean height:

Now, we need to know the total height of the boys, likewise:

At this moment, we also need to know the total height of the girls. It's simple, just subtract:

Finally, calculating the mean height of the girls (just divide the total height by the number of girls):

So, the mean height of the girls equals 1.48.

Hope this helps! :)

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step-by-step explanation: