Here are the results of a survey of 437 people in a town - OCR - GCSE Maths - Question 9 - 2017 - Paper 1

Since 153 females do not speak Spanish, we can find how many do speak Spanish by subtracting the non-Spanish speakers from the total number of females:

$280 - 153 = 127$

Thus, 127 females speak Spanish.

To find the proportion of females who can speak Spanish, we take the number of females who speak Spanish and divide it by the total number of females obtained earlier:

rac{127}{280}

To simplify, we can find the equivalent fraction to see if it is greater than or equal to rac{2}{5}:

rac{127 imes 5}{280 imes 5} = rac{635}{1400}

Next, we compare it to rac{2}{5}:

rac{2 imes 280}{5 imes 280} = rac{560}{1400}

Since $635 > 560$, we conclude that the proportion of females who can speak Spanish is indeed at least rac{2}{5}.

Thus, Jeff's statement that at least 2 out of every 5 females in the town can speak Spanish is correct.