Brainliest need help

Mathematics

1 answer:

erastova [34]3 years ago

4 0

Answer:

$p(71 < \times < 85) \\ = p( \frac{71 - 78}{4} < z < \frac{85 - 78}{4} ) \\ = p( - 1.75 < z < 1.75) \\ =1 - (\phi(1.75)) \\ = 0.46 \times 100\%\\ = 46\%$

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