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$4) \: mean = \frac{1.5 - 3.5 - 7 - 10 - 3}{5} \\ \: \: \: \: \: \: \: \: = \frac{ - 22}{5} = > - 4.4°C \\ 5) :(a) \: N + 2.3 = - 4.7 \\ \boxed{N = - 7} \\ (b) \: 2N + 6.8 = - 10.2 \\ \boxed{N = - 8.5} \\ (c) \: N \div 4 = - 2.7 = > - 2.7 \times 4\\ \boxed{N = - 10.8} \\ \\ \red{\mathfrak{\underline{\large{Hope \: It \: Helps \: You }}}} \\ \blue{\mathfrak{\underline{\large{Mark \: Me \: Brainliest}}}}$