4. Standard deviation and variance for a population You are interested in the development of language in bilinguals. You are able to locate five families in the world with 18-monthold toddlers who are learning both Swahili and Vietnamese simultaneously. Given that these are the only families that fit this qualification, therefore, these five families are your study population. You test the children to see how many words they can understand in Vietnamese. The results are listed in the following table: Toddler Number of Words in Vietnamese A 26 B 48 C 37 D 28 E 41 Calculate the mean for this population. Complete the following table. Toddler Number of Words (X) X - |.| (X - [.02 B 48 |:| |:| E 41 |:| |:| Calculate the variance and standard deviation for this population