The colours of fridges preferred by people living in a locality are shown by the following pictograph

Explanation

` (a)` Blue colour is preferred by 50 people.
( = 10, so 5 pictures indicate `5 xx 10` people).
`(b)` Deciding the number of people liking red colour needs more care.
For 5 complete pictures, we get` 5 xx10 = 50` people
For the last incomplete
picture, we may roughly take it as 5.
So, number of people preferring red colour is nearly `55`.