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1. Only the correct answer is needed. Please round to nearest mile....

1. Only the correct answer is needed. Please round to nearest mile.

2. Only the correct answer is needed. Find the lowest score on the final exam that would qualify a student for an A, a B, a C, and a D.

3. Only the correct answers are needed (no work needed):

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In a recent study on world happiness, participants were asked to evaluate their current lives on a scale from 0 to 10, where 0 represents the worst possible life and 10 represents the best possible life.
The responses were normally distributed, with a mean of 6.2 and a standard deviation of 1.9. Answer parts (a)-(d) below.
(a) Find the probability that a randomly selected study participant's response was less than 4.
The probability that a randomly selected study participant's response was less than 4
(Round to four decimal places as needed.)
(b) Find the probability that a randomly selected study participant's response was between 4 and 6.
The probability that a randomly selected study participant's response was between 4 and 6 is
(Round to four decimal places as needed.)
(c) Find the probability that a randomly selected study participant's response was more than 8.
The probability that a randomly selected study participant's response was more than 8 is
(Round to four decimal places as needed.)

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