1. Entomologist Heinz Kaefer has a colony of bongo spiders in his lab. There are 1000 adult spiders in the colony, and their weights are normally distributed with mean 12 grams and standard deviation 2 grams. (a) If a spider weighs 15.6 grams, what is the standard score (z-score)?

(b) What is the standard score of a spider in this colony that weighs 10 grams?

(c) Look at your answers for a and b. When the value is greater than the mean, what is the sign of the standard score? What happens to the sign when the value becomes less than the mean?

(d) About what percent of spiders in the colony weigh between 10 grams and 14 grams?

(e) About how many spiders in the colony weigh more than 13 grams? Remember to calculate the number of spiders, not a %

(f) What percent of the spiders weigh less than 9 grams?
(g) What is the weight of a spider at the 90th percentile?
(h) What is the weight of at the 15th percentile?

your answer would be 12

2 & 7

step-by-step explanation:

he climbs 300 ft/hr at a constant rate. the peak is at 1,500 ft.

when going up, he reaches 600 ft in 2 hours. remember, that he is going in a constant rate. divide 600 with 300:

600/300 = 2

assuming that he takes the same route back (meaning that it's a 1500 ft route back, you can solve.

note also that you are solving when he gets back to 600 ft after he reaches the peak.

first, find the amount of hours it takes to get up the peak. divide the total amount (1500), with the ft/her (300) to get the amount of hours (x):

1500/300 = x

x = 5

it takes jamie 5 hours to get up. now, he is returning down, and reaches 600 (his current destination). remember that he climbs at a constant 300 ft/hr. divide 600 with 300:

600/300 = x

x = 2

now add the two numbers together.

x = 5 + 2 = 7

jamie takes 7 hours to go up the mountain and reach his current position when descending.

(total amount/constant rate) = (time).

remember that it is a constant rate, so in total, when he gets back down the mountain, it will take the same amount of time as when he goes up. the total amount for the round trip is: 5 + 5 = 10.

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49%

step-by-step explanation:

when you realize that you dont know just realize i just took a test and im so smart

answer: 7

step-by-step explanation: