Answer:
To find the probability that the pebble picked is gray or white, we need to determine the total number of gray and white pebbles and divide it by the total number of pebbles in the bag.
Total number of gray pebbles: 19
Total number of white pebbles: 9
Total number of pebbles: 11 + 16 + 19 + 9 = 55
Therefore, the probability of picking a gray or white pebble is:
P(gray or white) = (19 + 9) / 55 = 28 / 55 ≈ 0.5091 (rounded to four decimal places)
So, the probability that the pebble picked is gray or white is approximately 0.5091.
