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The mean thickness and variance of silicon steel laminations are $0.2 mm$ and $0.02$ respectively. The varnish insulation is applied on both the sides of the laminations. The mean thickness of one side insulation and its variance are$0.1 mm$ and $0.01$ respectively. If the transformer core is made using $100$ such varnish coated laminations, the mean thickness and variance of the core respectively are

- $30 mm$ and $0.22$
- $30 mm$ and $2.44$
- $40$ mm and $2.44$
- $40 mm$ and $0.24$

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