Homework Help is Here – Start Your Trial Now!
Math
Probability
A study performed by the Pew Research Center reported that 58% of customers used their phones inside a store for guidance on purchasing decisions. A random sample of 35 customers is surveyed. a) Find the probability that exactly 21 have used their phones inside a store for guidance on purchasing decisions. b) Find the probability that more than 25 have used their phones inside a store for guidance on purchasing decisions. c) Find the mean number of customers out of 35 who have used their phones inside a store for guidance on purchasing decisions. Do not round. d) Find the standard deviation number of customers out of 35 who have used their phones inside a store for guidance on purchasing decisions. Round to one decimal place.

A study performed by the Pew Research Center reported that 58% of customers used their phones inside a store for guidance on purchasing decisions. A random sample of 35 customers is surveyed. a) Find the probability that exactly 21 have used their phones inside a store for guidance on purchasing decisions. b) Find the probability that more than 25 have used their phones inside a store for guidance on purchasing decisions. c) Find the mean number of customers out of 35 who have used their phones inside a store for guidance on purchasing decisions. Do not round. d) Find the standard deviation number of customers out of 35 who have used their phones inside a store for guidance on purchasing decisions. Round to one decimal place.

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
See similar textbooks
icon
Related questions
Question
Can’t figure out how to solve
A study performed by the Pew Research Center reported that 58% of customers used their phones inside a store for guidance on purchasing decisions. A random sample of 35 customers is surveyed. a) Find the probability that exactly 21 have used their phones inside a store for guidance on purchasing decisions. b) Find the probability that more than 25 have used their phones inside a store for guidance on purchasing decisions. c) Find the mean number of customers out of 35 who have used their phones inside a store for guidance on purchasing decisions. Do not round. d) Find the standard deviation number of customers out of 35 who have used their phones inside a store for guidance on purchasing decisions. Round to one decimal place.
Transcribed Image Text:A study performed by the Pew Research Center reported that 58% of customers used their phones inside a store for guidance on purchasing decisions. A random sample of 35 customers is surveyed. a) Find the probability that exactly 21 have used their phones inside a store for guidance on purchasing decisions. b) Find the probability that more than 25 have used their phones inside a store for guidance on purchasing decisions. c) Find the mean number of customers out of 35 who have used their phones inside a store for guidance on purchasing decisions. Do not round. d) Find the standard deviation number of customers out of 35 who have used their phones inside a store for guidance on purchasing decisions. Round to one decimal place.
Expert Solution
steps

Step by step

Solved in 5 steps with 4 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer