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When to use normal approximation for Hypothesis Testing??

The question: https://gyazo.com/a15e0500c5a35033a651a8ea8668ca87

Question (a) was just checking the significance and I acepted the null Hypothesis.

Question (b) just had me confused, and when I checked the mark scheme it just switched on to using normal distribution. The question didn't indicate to use it though, so i'm confused.
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Notnek
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Original post by OJ Emporium
The question: https://gyazo.com/a15e0500c5a35033a651a8ea8668ca87

Question (a) was just checking the significance and I acepted the null Hypothesis.

Question (b) just had me confused, and when I checked the mark scheme it just switched on to using normal distribution. The question didn't indicate to use it though, so i'm confused.

"Using a suitable approximation"

I've seen questions where it isn't obvious that you need to use a normal approximation but I'm not sure why you were confused by this one.
Original post by Notnek
"Using a suitable approximation"

I've seen questions where it isn't obvious that you need to use a normal approximation but I'm not sure why you were confused by this one.

I'm not really the best when it comes to stats lmao

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