请教几道刚做到prep光盘里的数学题

cx_ding

1. For every positive even integer n, the function h(n) is defined to be the product of all the even integers from 2 to n, inclusive. If p is the smallest prime factor of h(100)+1, then p is

A between 2 and 10

B between 10 and 20

C between 20 and 30

D between 30 and 40

E greater than 40

2. Score Interval：50-59   60-69   70-79   80-89   90-99

    Number of Scores: 2        10        16          27      18

The table above shows the distribution of test scores for a group of management trainees. Which score interval contains the median of the 73 scores?

A 60-69        B 70-79        C 80-89        D 90-99        E It cannot be determined from the information given.

3. Alice's take-home pay last year was the same each month, and she saved the same fraction of her tak-home pay each month. The total amout of money that she had saved at the end of the year was 3 times the amount of that protion of her monthly take-home pay that she did not save. If all the money that she saved last year was from her take-home pay, what fraction of her take-home pay did she save each month?

A 1/2        B 1/3        C 1/4        D 1/5        E 1/6

4.If x and y are positive integers, is the product xy even?

(1) 5x - 4y is even.

(2) 6x + 7y is even.

5. The number 75 can be written as the sum of the the squares of 3 different positive integers. What  is the sum of these 3 integers?

A 17      B 16        C 15        D 14         E 13

6. If n is a multiple of 5 and n=p平方*q, where p and q are prime numbers, which of the following must be a multiple of 25?

A p平方      B q平方      C pq        D p平方*q平方     E p3次方*q

7.有一组数据 7.51   8.22   7.86   8.36   8.09   7.83   8.30   8.01   7.73   8.25   7.96   8.53

A vending machine is designed to dispense 8 ounces of coffee into a cup. After a test that corded the number of ounes of coffee in each of 1000 cups dispensed by the vending machine, the 12 listed amounts, in ounces, were selected from the data. If the 1000 recorded amounts have a mean of 8.1 ounces and a standard deviation of 0/3 ounce, how many of the 12 listed amounts are within 1.5 standard deviations of the mean?

A Four        B Six        C Nine        D Ten        E Eleven