一个小组里有30名男生和女生。这些儿童的平均身高是145厘米。当又有3名男生加入该小组时，每位学生的平均身高增加了0.5厘米。小组中女生的总身高是1820厘米。 下面的每个陈述要么是正确的，要么是错误的，要么是根据所给信息无法判断的。对于每个陈述，请打勾（ $\checkmark$ ）以表示你的答案。

陈述	正确	错误	无法确定
新加入小组的3名男生的平均身高是150.5厘米。
在这3名男生加入小组之前，所有男生的平均身高大于145厘米。

1. Calculate the total height of the 30 children initially

$\text{Total height initially} = 30 \times 145 = 4350\text{ cm}$

2. Calculate the new total height after 3 boys joined

$\text{New number of children} = 30 + 3 = 33$
$\text{New average height} = 145 + 0.5 = 145.5\text{ cm}$
$\text{New total height} = 33 \times 145.5 = 4801.5\text{ cm}$

3. Evaluate the first statement by finding the average height of the 3 new boys

$\text{Total height of 3 new boys} = 4801.5 - 4350 = 451.5\text{ cm}$
$\text{Average height of 3 new boys} = 451.5 \div 3 = 150.5\text{ cm}$
Therefore, the first statement is True.

4. Calculate the total height of the boys initially

$\text{Total height of boys initially} = 4350 - 1820 = 2530\text{ cm}$

5. Evaluate the second statement

To find the average height of the boys initially, we need to divide their total height ($2530\text{ cm}$) by the number of boys. Since the exact number of boys in the initial group of 30 is unknown, we cannot calculate their average height. For example, if there were 17 boys, the average would be $2530 \div 17 \approx 148.8\text{ cm}$ (greater than 145), but if there were 18 boys, the average would be $2530 \div 18 \approx 140.6\text{ cm}$ (less than 145).
Therefore, the second statement is Not possible to tell.