单选题What is the standard deviation of the three numbers x+5, y+5, z+5?1The standard deviation of x and y is greater than 0.3.2The standard deviation of x, y and z equals to 0.2.
单选题Patrick usually provides child care for six
单选题The median of 21 different integers is 17. Which of the following is the least possible of the range of these integers?
单选题一个人掷飞标，击中靶心的概率为0.7，如果这个人连续掷4次飞标，其中有2次击中靶心的概率是多少?
单选题In the equation b=ka+3, k is a constant. If the possible solutions are in the form a, b, is 2, 3a solution to the equation?11, 4 is a solution of the equation b=ka+2.23, 5 is a solution of the equatio
单选题A large flower arrangement contains 3 types of flowers: carnations, lilies, and roses. Of all the flowers in the arrangement, 12 are carnations, 13 are lilies, and 16 are roses. The total price of whi
单选题集合{1，2，3，4，5}有多少个包含元素1的子集?
单选题已知自然数a，b，c，其中c≥3，a除以c余数为1，b除以c余数为2，那么ab除以c余数为多少?
单选题共有A，B，C，D，E 5个元素要放在有顺序的5个位置上，要求满足条件：A在B之前，B在C之前A＞B＞C，问一共有多少种排法?
单选题If x, y and z are positive integers such that x is a factor of y, and x is a multiple of z, which of the following is NOT necessarily an integer?
单选题There are 30 pairs of socks in a drawer, 60％ of the socks are red and the rest are blue. What is the minimum pairs of socks that must be taken from the drawer without looking in order to be certain th
单选题A major health insurance company in Lagolia pays
单选题If m and n are positive integers, what is the value of 3m+n4?1 mn = 122 3m is in lowest terms and n4 is in lowest terms.
单选题小明的贮钱罐里一共有26元的硬币，硬币只有两种，5角的和1元的。如果5角的硬币数目小于1元的硬币数目，那么小明最多有多少个5角硬币?
单选题Psychologist: In a study, researchers gave 100
单选题6个相同的球放在1，2，3，4四个杯中，要求每个杯中至少放一个，一共有多少种不同的放法?
单选题Mr. Smith deposited k dollars in a new account at an annual rate of 8 percent compounded quarterly, which of the following represents the value, in dollars, of the money in the account after 2 years?