Question

12 13 The table below shows a random sample of musicians and how they learned to play their instruments. Gender Self-taught Studied in School Private Instruction Total Female 33 24 Male Total 25 Find P(musician is a female OR is self taught). (Enter your probability as a fraction.) P(musician is a female OR is self taught) = Additional Materials 23 56 25 49 69 61 130 eBook 19. (-/1.78 Points] DETAILS ILLOWSKYINTROSTAT1 12.PR.031. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An electronics retailer used regression to find a simple model to predict sales growth in the first quarter of the new year (January through March). The model is good for 90 days, where x is the day. The model can be written as follows: 9 - 103.38 + 2.45x where is in thousands of dollars. What would you predict the sales to be on day 30? (Enter an exact number as an integer, fraction, or decimal.) thousand dollars Additional Materials

Answer 1

Solution:-

P(musician is a female or is self taught) =
= P(female) + P(self taught) - P(female and self taught)
= (69/130) + (25/130) - (12/130)
= 0.6308

19.

The predict the sales to be on day 30 = 176.88

=> y = 103.38 + 2.45x = 103.38 + (2.45*30) = 176.88