What is the expected value for the binomial distribution below? Successes 0 1 2 3 4 5 Probability 1024/3125 256/625 128/625 32/625 4/625 1/3125

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

Kayaks rent for $35 per day. which expression can you use to find the cost in dollars of renting 3 kayaks for a day?