Help needed with changing a inner tube

Hi, Im very much a newbie so please be gentle with me as I need some advice.
Its only a small query in my eyes but I haven't got a clue. My GF has just started riding a bike to keep fit. She had a puncture on the weekend so yep you guessed it I have the job of fixing it!
I've removed the wheel and the inner tube but the sizes are confusing me. It states I need a 26 x 1.5/1.75 replacement on the wheel; does it have to be that size, or can it be anything around it. I've been looking online and you can buy ones for example that are 26 x 1.1/1.5 or 26 x 1.75/2.2 ...... so is the 1.5/1.75 a guide or does it have to be exactly what its asking for....
sorry if I sound dumb as this is all new to be so any help is gratefully received
Its only a small query in my eyes but I haven't got a clue. My GF has just started riding a bike to keep fit. She had a puncture on the weekend so yep you guessed it I have the job of fixing it!
I've removed the wheel and the inner tube but the sizes are confusing me. It states I need a 26 x 1.5/1.75 replacement on the wheel; does it have to be that size, or can it be anything around it. I've been looking online and you can buy ones for example that are 26 x 1.1/1.5 or 26 x 1.75/2.2 ...... so is the 1.5/1.75 a guide or does it have to be exactly what its asking for....
sorry if I sound dumb as this is all new to be so any help is gratefully received

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Your range is 1.5/1.75, so check that this range fits in one of the two halfords range.
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...why the smaller?
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