צור שיעורים טובים יותר מהר יותר
עִברִית
דף הבית מאפיינים תוכניות מחיר  קהילה
1) Which of these #'s is a probability? a) 130% b) - 4% c) 24/5 d) 0.0023 2) Which of these #'s cannot be a probability? a) 0.502 b) 12/78 c) 23% d) 23/10 3) Pick a number from 1-20. What are the chances the number is an even number OR a 9? a) (10/20) + (1/20) = 11/20 b) (1/2) x (9/20) = 9/40 c) (10/20) x (1/20) = 10/400 d) (10/20) + (9/20) = 19/20 4) Pick a number from 1-100. What are the chances the number is less than 51? a) 51% b) 50% c) 49% d) 1% 5) A player has a batting average of .356 (35.6%). How many hits can we expect after 30 attempts?  a) 30 hits b) 356 hits c) 10 hits d) 11 hits 6) Is the chance of getting a hit for each at bat independent of one another? a) Yes b) No 7) Tom's batting average is .256. Out of 200 at bats (attempts), how many times can we expect him to get out?  a) 149 b) 180 c) 250 d) 51 8) Dave's batting average is .237. What are his odds of two hits in a row? a) 7.48% b) 5.61% c) 5.62% d) 23.7% 9) A goalie has a .913 save percentage (91.3%). After 47 shots, how many saves are expected? a) 47 b) 43 c) 4 d) 45 10) Save percentages and batting averages are examples of... a) Experimental Probability b) Theoretical Probability 11) A goalie has a .934 save percentage, how many goals against would we expect after 2483 shots on net? a) 234 b) 2319 c) 164 d) No goals against, she is legendary. 12) Carey Price (goalie) has an all time save percentage of .917, with 20911 shots against. How many saves? a) 19175 b) 19357 c) 20910 d) 18037 13) A friend has chosen 2 different #'s between 1 and 10. What is the chance that you correctly guess both? a) 2/10 b) (1/10) x (1/9) = 1/90 c) (1/10) + (1/9) = 19/90 d) 100%. I'm just that good. 14) There's a 70% Chance of Rain on Sat, 80% chance of rain on Sun. P(Rains on both days) = ? a) (70%) + (80%) = 150% b) (70%) x (80%) = 56% c) (70%) x (80%) = 5600% d) 75% 15) There's a 70% Chance of Rain on Sat, 80% chance of rain on Sun. P(No Rain at all) = ? a) (30%) x (20%) = 6% b) (30%) x (20%) = 600% c) (30%) + (20%) = 50% d) 80% - 70% = 10% 16) Mr. Samson buys 2 lottery tickets where there is 10% winning tickets. P(2 winning tickets) = ? a) (10%) + (10%) = 20% b) (90%) x (90%) = 81% c) (10%) x (10%) = 1% d) (10%) x (10%) = 100% e) Mr. Samson always wins 17) Mr. Samson buys 2 lottery tickets where there is 10% winning tickets. P(2 losing tickets) = ? a) (90%) + (90%) = 180% b) (10%) + (10%) = 20 % c) Mr. Samson never loses d) (90%) x (90%) = 81% 18) After 40 spins, how many times would I expect to land on an odd #? a) 40 times b) IDK, an odd # of times? c) 17 times d) 30 times 19) If spun twice, what are the chances of getting a 1 and then a 5 in a row? a) 4.69% b) 15% c) 6% d) 4% 20) After 1 spin and rolling an 8 sided die, P(spinning a blue AND rolling a 7) = ? a) (3/8) + (1/8) = 1/2 b) (1/8) x (1/8) = 1/16 c) (3/8) x (1/8) = 3/64 d) (3/8) x (7/8) = 21/64

Probability in The Real World

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