Question
OCR J560/02 — Foundation (calculator)
A survey of 240 people asked whether they own a dog and whether they own a cat. The frequency tree below is partially completed:
- Total: 240
- Own dog: 90 → of which 30 also own a cat (so 60 own dog only).
- Don't own dog: 150 → of which x own a cat.
- Total cat owners (across both branches): 80.
(a) Find x. [2] (b) How many people own neither a dog nor a cat? [2]
4 marks · take your time before peeking.
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