We are given that the average height of 5 friends is 153 cm. This means the total height of all five friends is:

$\text{Total height} = 153 \times 5 = 765 \text{ cm}$

We also know the heights of three friends:

• Ken = 148 cm
• Maria = 145 cm
• Marcus = 162 cm

The sum of their heights is:

$148 + 145 + 162 = 455 \text{ cm}$

Let the height of each of the remaining two friends be x cm. Since they have the same height, their total contribution is:

$2x$

Now, we set up the equation:

$455 + 2x = 765$

Solving for $x$:

$2x = 765 - 455$

$2x = 310$

$x = 155$

Thus, the two remaining friends are 155 cm tall each.

Would you like a step-by-step breakdown for clarity? Here are some related questions to explore:

1. What happens to the average height if a new person of 160 cm joins the group?
2. How would the answer change if one of the remaining two friends was 157 cm instead?
3. Can you find the median height of the group after solving for the missing values?
4. How would the average change if Marcus were replaced with someone 10 cm shorter?
5. How do you calculate the range of the given heights?

Tip: When solving for an unknown in an average problem, always start by finding the total sum using the given average!